NOVEMBER 4TH 1987 to NOVEMBER 3RO 1988

Resubmit to

Doc:. Ret.

_. .1-1-;::-:---;

Dilte

T~SM~NI~ MINES LIMITEO

732001

EXPLOR~TION LICENCE 17/68

~NNU~L REPORT

Cliff H. Whitehead.for and on behalf ofT~SM~NI~ MINES LIMITEO.

JO~o­IIIIIIIIIIIIIIIIIIII

•••• continued

The test work consisted of the following programme:­

crush to minus 4mm

73200254· 2. ~ 2, 00 N

3"(,00 a

1Il-L- SA"",P'-6'S OlS"lAlt.lE.'l:> flZ.0t'-'\ o'Vc;.2. WOLLASTONITE INVESTIGATIONS. L.OC.'<'\"rJON.e-~lb ~ c.~qq",'2912.-

( !'(E:l....L.Y6e,)Two independent metallurgical investigations have been completed on representativewollastonite samples, these being at the Department of Mines Laboratories,Launceston, and at the Mineral Sands Consulting Group, Brisbane.

Activities within E.L. 17/68 during the current year were not as extensive asoriginally proposed.

Due to budgetary constraints, surface exploration work and proposed drillingover and on ground with significant magnetite and tungsten potential was notinitiated as planned.

grind (ball mill) to minus 600 microns

Jones wet magnetic separation

non magnetic product subjected to calcite froth flotation (DenverLaboratory flotation cell).

flotation tailing product (wollastonite concentrate) subjected to silicafroth flotation.

products submitted for chemical analyses (primarily L.O.I., CaO, Si02,MgO, Fe203, AI 203).

products submitted for mineralogical examination.

Test work resulted in producing a rougher flotation tail product constituting51.8% of the sample and having a calculated 70.5% wollastonite content. However,the conventional silica flotation tests of this sample did not achieve anyadditional wollastonite content concentration or Si02 removal.

Final reports on both of the above test work are attached as Appendices A andB. Below are documented details of the nature and results of the investigations.

(A) Mines Department, Launceston, test work (Appendix A)

A20kg wollastonite sample from surface exposures at the Limestone Creek areahas been subjected to bench scale metallurgical tests and mineralogical!chemical analyses. The prime objective of the work was to assess variouspossible techniques of upgrading the material to a wollastonite concentratesuitable for commercial evaluation.

Investigations of wollastonite deposits located within the E.L. 17/68 areawere however completed during the current term, these studies being in theform of metallurgical/bench test work on representative surface samples fromthe Limestone Creek occurrences. Refer to Figure No.1. Proposed Explorationwork to evaluate the potential of wollastonite ground in the eastern sectionof the E.L. was not undertaken.

, '.v.1

1. INTRODUCTION - NATURE OF WORK.

IIIIIIIIIIIIIIIIIIII•

.2/

IIIIIIIIIIIIIIIIIII•

Chemical analyses show the following:-

CaO Si02 tJgO Fe203 A1 203 L.O.!.

Head Sample 39.5 41.4 3.5 1.3 2.3 9.0

Rougher Wollastonite 41.4 52.1 2.7 0.8 2.4 0.62Concentrate

Firing tests (electric furnace for six hours at 1000·c) on the producedwollastonite concentrate (to assess its ceramic potential) produced aslight pinkish coloured product (oxidation of contained iron).

Wollastonite samples produced from this test work are being provided topotential buyers.

(B) Mineral Sands Consultancy test work (Appendix B)

Metallurgical tests co-ordinated by the above group have been underway sincemid May 1988.

The techniques applied were as follows:-

rolls crush to minus 300 micron (Fox-Anamet, Sydney)

process through Wet High Intensity Magnetic Separator (Readings)

Whims non-magnetic fraction subjected to flotation tests (Amdel) afterregrinding to minus 150 micron. An anionic float was used to rejectcalcite, followed by cationic float to reject silica/quartz.

The products were examined mineralogically and chemically.

Flotation tests showed that a wollastonite product was produced, which byAmdels chemical assessment contained 57.56% wollastonite, and 70% by W. F~nder

mineralogical examination.

The main remaining contaminent in the product was believed to be diopside.

3. EXPLORATION EXPENDITURES.

Total expenditures incurred within Exploration Licence 17/68 during the period22nd OCtober 1987 to 21st September 1988 amount to $24,183.

A breakdown of these expenditures are itemised overleaf (Table No.1).

Cliff H. WhiteheadGeologist29.09.1988

EXPLORAT10N LICENCE 17/68

EXPLORATION EXPEND1TURES

TASMANIA MINES LIMITED TABLE NO. 1-------

PER10D 5 6 7 8 9 10 11 12 13 z 3

DATE 22.10.87 19.11.8717.12.8714.1.88 11.2.88 10.3.8818.11.87 16.12.87 13. 1.88 10.2.88 9.3.88 6.4.88

7.4.88

5.5.88

6.5.88 2.6.88 30.6.88 28.7.88 25.8.88TOTALS1.6.88 29.6.88 27.7.88 24.S.88 21.9.88 -------

$ $ $ $ $ $ $ $ $ $ $ $

GEOLOGY 2000 2500 2000 3500 1000 1000 450 225 450 13,125------DRAFTlNG 992 1273 711 881 138 300 4,295

WOLLASTON ITE

1365 720 969 62 691 1302 5,109

TENURE 715 563 230 (1000 ) 389 897

OTHER EXPENSES

437 320 757

TOTALS 5072 3773 4431 '~931 138 300 1969 512 1305 1752 NIL NIL 24,183

~,,...)

"------

c,.;... - - - - - - - - - - - - - - - - - - - •

732005

FIGURE No. I

E.L. 17/68 - LOCATION PLANw

+

+

+

+

+

+

+

+ HOUSETOP +gRANITE

REgiON

LEGEND

o PROSPECTS

D DEVONIAN GRANITE

o Ikm! ,

Scal.

NT. MISERYREGION

"\ I: ),-,

lolL'SAPPLICATIONAREAS

LOC.OL II CON. LEASE

1011101· 77

ST. VALENTINESREGION

lAY

LOU DWATERCREEKREGION

+

'Wu

/+RINGWOOD

GR.

I STOCKREGION

+

5cm

,In {' . G5

IIIIIIIIIIIIIIIIIII•

E.L.17/68

ANNUAL REPORT

APPENDIX A

732006

Please find enclosed R886 Wollastonite Concentrationby Metallurgist Ken Austin, and Appendix by R. Bottrill.

,

732007

6th July 1988

Launceston Office:

Chemical and MetallurgicalLaboratory,287 Wellington Street,LAUNCESTON 7249

Attention Mr. J. Scales

R886

DEPARTMENT OF MINES

Chief

Dear Sir,

Tasmania Mines Ltd ,P.O. Box 815Burnie 7320TASMANIA

TASMANIA

EnquIries:Phone:Your ref.:Our file:

Irr,

IIIIIIIIIIIIIIIIIII• Telephone (OO3y,442431 Fax (003) 44 6565

I, r~

III

< ...

'v {

TASMANIA MINES

Introduction:

732008

4TH July 1988

R886

WOLLASTONITE CONCENTRATION

IIIIIIIIIIIIIIIII

Tasmania Mines requested that experimental workbe undertaken on a low grade sample of Wollastonite (from theirKara depositl to produce a Wollastonite concentrate forcommercial evaluation.

Object:To produce a quantity of high grade Wollastonite.

Sample:The sample submitted Reg. No 880509 consisted of

approximately 25 kilograms of pieces of Wollastonite oreranging from about 5mm to 25mm in size.

Method:

1. The as received ore was Jaw crushed to -4mm,mixed, then riffled to produce:

(a) A head sample for Chemical analysis.

(bl 10Xl kilogram samples for test work.

2. Each of the 1 kilogram test samples wereseparately ground in a laboratory ball mill at forty percentsolids for 25 minutes. Any + 600um material remainingwas reduced to -600Um by mortar and pestle.

J. One kilogram of ground ore was wet then dryscreened to provide a description of grind.

4. Two of the one kilogram ball mill ground sampleswere combined (test Nil and fed to a Jones Wet MagneticSeparator using the following conditions.

(a) Maximum magnetic strength (i.e. 40 amp current)

Cb) feed rate 250g/minute

(c) Wash water J litres/minute

5. The Jones magnetic product was fed to a DavisTube for ball mill iron removal.

6. The Jones Non magnetic product was subjected tocalcite froth flotation in a Denver laboratory flotationcell using the following reagents and conditions.

- 2-

732009

Appendix 1 is a copy of his evaluation of those products.

Results Obtained

7. The flotation tailing product (Wollastonite concentrate)was sUbjected to silica froth flotation in a Denver laboratoryflotation cell using the following conditions and reagents.

5 minutes

5 minutes

4 kg/tonne

1.5 kg/tonne(Collector)

( a ) Sodium carbonate (Regulator) 0.6 kg/tonne

(b) Oleic acid (Collection) 3.3 kg/tonne

( c ) Aero frother 77 (Frother)

(d) Flotation time 5 minutes

(e) Cleaner Flotation time 5 minutes

(b) Fuel Oil

(a) Aeromine 3037 (Collector)

(c) Aerofrother 77 (Frother)

(d) Flotation Time

(e) Cleaner Flotation Time

l. Head Sample analysis

Percent L.O.1. 9.0

Percent CaO 39.5

Percent Si0 2 41.4

Percent MgO 3.5

Percent Fe 2 0 3 1.J

Percent A1 20 J(2. J )

Calc. 01. Wollastonite 42. °

8. Except for the Davis Tube magnetics or ball mill ironproduct, all Nl products were assayed for Loss on Ignition,CaO, MgO, Fe 2 03 , A1 2 03 , and Si0

2.

9. A further Jones Magnetic separation test was performed on6 kilograms of sample with the non magnetic product beingsubjected to rougher calcite froth flotation only. Allconditions used were those as previously described. Thistest was termed N2 and orl1y the rougher flotation tailorWollastonite concentrate was analysed.

10. Portion of the products of Test Nl and the ball mill(description of grind) particle size analysis were submittedalong with chemical analysis to Mineralogist R.S. Bottrillfor examination.

,_r~ ".'" rio

.Uij

IIIIIIIIIIIIIIIIII•

- 3 -

2, Sizing AI\alyses - 25 Minute Ball Mill Grind,

-4000 + 2360 0,4

-2360 + 1180 0,1

-1180 + 600 0,1

- 600 + 300 0.1

- 300 + 150 2.7

- 150 + 75 3.7

75 + 38 0.3

(- 38) (92.6J

CIS 1 19.8

CiS 2 21. 6

CiS 3 12.8

ciS 4 13,2

CIS 5 6.0

OIF Cl9.2J

Head 100,0

Mass

732010

Percent

0.4

0.5

0.6

0.7

3.4

7.1

7.4

ClOO.OJ

27.2

48.8

61. 6

74.8

80.8

100.0

Cumulative

Mass

Percent

\lm

Particle

size

~ C'

IIIIIIIIIIIIIIIIIII

",".\".,•

----------------------6

- 5 -

The calculated Wollastonite content of the Rougher FT (Wollastonite concentrate was found to beapproximately 70.5 percent in a mass of 51.8 percent overall.

4. 5ilica Flotation of Rougher FT (Wollastonite Cone.)

Product

CFC

CFT

FIC

FIT

FT

'/, % % '/, % % %Mass L.a.l. CaD 5i0 2 MgO Fe 2 03 A1

20

3

34.3 0.77 41.7 51. 8 2.2 0.90 2.2

2.4 0.75 39.8 51. 5 3.5 0.87 3.1

36.7 (0.77) (41.6) (51.8) ( 2 . 3 ) (0.90) (2.3)

15.1 0.70 39.9 51. 3 3.5 0.70 2.3

51.8 (0.75) (41.1) (51.6) ( 2 . 6 ) (0.84) ( 2 . 3 )

Whilst it is readily apparent that the Wollastonite concentrate contains an excess of 5i02

,conventional silica flotation did not achieve any 5i0 2 removal Or concentration.

---------------- - - - - -

1#'1"~~";\"

"2,'~,:

M..-IoC\lMf'-

5. Overall Results Test N2.

6

!?roduc t

fIT (Wollastonite Conc)

FIC (Calcite Conc)

Jones MiS N

Jones MIS W (washings)

JOf\es MiS MIA

Head

%Mass

55.0

29.1

84.1

1l.8

4.1

100.0

%L .0.1.

0.9

CaO

10.8 51. 9

%MgO

2.8

%

0.9

%

2.3

The yield and chemical composition of the Wollastonite product from test N2 was very similarto that of test Nl. Test N2 was only performed such that a quantity of Wollastonite concentratewould be available for commercial evaluation.

6. Fusion Point Determination of Concentrate.

The fusion point ofsoft~nif\g point was found

othe test N2 Wollastonite concentrate was found to be 1400 C.to be 1280 0 C.

The

- -----.

- 7 -

Conclusion

7. Firing Tests of N2 Concentration

k !h4-(~............ /. ..

732014

MetallurgistK. Austin

Small test pieces were made (using the WollastoniteConcentrate) and fired in an electric furnace for six hours at10000C. The surfaces of the fired test pieces showed aslight pink tinge probably due to the oxidation of thecontained iron (0.9% Fe

Z0

31. Superficial fritting occurred

and the test pieces were quite fragile.

This investigation has shown that it is pessible toupgrade this ore containing 42% Wollastonite to a concentratecontaining 70% Wollastonite by means of wet magnetic separationand flotation. The Company has been supplied with a sampleof concentrate for market evaluation. When the results ofthis evaluation are known some discussion should ensueon whether further test work should be undertaken.

'r' .-J,_ ll.;..

IIIIIIIIIIIIIIIIIII•

The samples were all run on the X-ray diffractometer, calibratedexternally with pure and weighed mixes of minerals simild~ to theconstituent phases (calcite, wollastonite. diopside and feldspar)CalIbration was dIffIcult due to the mlxture of several mlnerals withcomplex X-ray patterns and indefinite composiU.. ons. The results ares~own in Table 1,

Thp .'<RP analyses (TabLe 21 W'€r:e convertE>d lnto iTlineralogicalconstitutIons (Table 5) uSlng t.he estimated mlnera. l compositions in

Table 1. These figures may be more accut:ate than those in TabLe butshould still be used with caution as accurate mln~ral compositions are

not availa.ble-; Quartz: and haematite were not detected but. ace

represented in Table: 5 to indicate excess s~lica and Fe 2.03 from thecalculations, which could' be corrected t.o, zero by man~pulation ofmineral compos:itions.~ Nat, and Ie in the XRF analyses could indicate some­albice and alkali feldspars.

The measured whole-rock analyses (Table 2, by XRF) were used to estimatecompOSltions for constituent phases ('fable Jl and thus calculate theE'xpected whole-rock compoSition (Table 4). The measured and calcula.tedcompositions are not in particularly 9oodagreement.: CaO, S10

2and

CO2

are generally comparable (A2 would be better if an iron-beol:'"lnqphase could have been measured) but the ffilnor components_ A1

20

J, MgO and

rt"20J correldte poorly. This suggests that. the calibrating samplE'S mayhave been lnapp(opriate In compOsition for these products, and/or t.'1'"'

ffilnerals have greater compositional varIability tllan expected. Th~

.:esults in Table 1 are thus more prec.lse than accur-att:' dnd may onl y bE'taken to lndicate relative compositional trends.

a res f rom (hemIneralogical

732015

H£'J{j O:llce

GurUons Hill Road,p·O 801 I)f),

ROSN'I P~RX 1018

1APPENDIX

DEPARTMENT OF MINES

RSB(2) ,JH

Mr P. James,

Chief Chemist & MetallurgIst,Department of Mines,LAUNCESTON

R886 -WOLLASTONITE PRODUCTS, KARA

Sixteen products from metallurgIcal tests on wollastonlteKara area were submitted for determInation of theirconstitution. Sample details are summarised in Table 1.

i4

't" ell!' r r:-'':>If ::;1'

:':nClINlt~.·; R. S _ Bot t. rill

.Jhonl..: 30 8 ]59

Ir :

IIIIIIIIIIIIIIIIIII•

I

r .-10......~-=--

?32016

IIIIIIIIIIIIIIIIII

2.

The calculated mineralogy of the feed (Al 1n 'l'able 51 1S about 42~wollastonite, 2 n diopside, 20~ calci tc and 9~ Ee ldspar. This indicatesa Ettle more diopside than expected from prel1mina r y studies (see myprev10US memoranda of November 1985 and February 19881 The ore samplesexamined to date indicate ranges in mineralogy of about: JQ-70%woLLastonite, 5-60~ calc1te, 1-20% diops1d e , 2-40~ [eldsl"ar and 1-2%sull"hides. The ore is obviously very varlable and more selective mining

may be necessary to maximIse the wollastonite 1n the feed.

;//" '.;...-- /,-\::~_. f .--r;r:./".,,/-l (. r~'.Lt: 1.r,J

R.S. BottrillMINERALOGIST/PETROLOGIST

Encl.

- 3 -

XRF(Wt:t:)

- ~. •j. b

fable I. MIneral Constitution by XHD (WI. %. scml-quantltollvol.dId

~AbDreYlallOns In table b.

T bl 2 Wh I

nn samn e OSCrlllt ions.~40. DEr,cr I[illQfI WfJlI.• Di Calclto Fsp-~._-

AI Hero - - - -

A2 Jones II/~. IliA 65 50 4 1,0.3 lsi. M/~ lesl,-GOe 81 \7 1 1AS Jones w~sh In9s 6q 18 12 IA6 (FC (wleile CfJfI) 19 1I 68 2.~7 CFT (Middling) 76 18 ~

~ 1L

AI'. FT (Wo II (i)n) 92 7 () IA9 CIS 1 74 13 I I 2AIO US 2 79 7 13 IAll CIS 3 77 10 12 IAIZ C/S 4 79 10 10 1AI3 CIS 5 77 9 13 IAI~ -~OOO' ISOlJrn 83 I I 5 I,~ 15 - 150'3811rn 83 10 6 IA17 F\ T 91 iJ 0 IAlB F2T 9t: 5 I 2AI9 F2C 9~ 4 0 2

Table 3. Estimated Mineral Comoositions (WI. %)No Si02 AI 20.3 Fe203 MC1J CaO CO2 S03 lolalWull. 51.7 0 a 0 483 a 0 100Di 53 2.5 36 15 25.9 0 0 100Caicile U 0 CJ CJ 56 44 a 100Fso (An 64.3 18.3 0 0 17 a 0 100.1Utz 100 (I CJ 0 0 0 0 100Po 0 0 '=107 0 a 0 91.2 131.9

a e o e roc analyses -1,10. Si02 A1203 Fe203 Met) CaO CO2 S03 tolal/\ 1 41. 44 230 1.32 3.47 39.51 8.97 0.10 97.11A2 4451 347 10 Or, 7.n 29.67 3.52 112 9962AS 45.0S 271 1.49 5.~7 37.90 5.35 0.08 98.05

IA6 20.96 146 CJ 90 3.53 ~424 25.51 002 96.62

1: 7 4"h 7 26y 152 5.61 36.72 1.23 0.04 97.28AC S2.03 2.37 078 2.67 4114 0.62 003 99.69

-j

IIIIIIIIIIIIIIIIIII

•

Tilb10 5: Ca\l;ululed mlnoral constitlJtion (from Toblo 2).No Wall Di Calcite Fsp(An) Otz Po Hem TotalAI 42.46 231 20.4 9.4 1.13 o I I 0.39 97.02A2 2161 48.5 8.0 12.3 -0.35 1. 23 720 98.51AS 41 34 36.5 12.2 98 -2.02 0.09 0.10 9797A6 100 I 23.5 580 4.8 0.22 0.02 0.03 9657/\7 49.40 37.4 2.8 9.6 - 2. \ I 0.04 a 1·3 9726A8 I 7045 17.8 1.4 10.5 -0.59 r,o-) 0.1 I 9973

732018

T bl I

- 4 -

1 I \ d r

f oble 6' Abbreviotions

T bl 4 Wh 1

Viall Wollastonite (CaSi03)[)J DJopsloo (CaMgSi206)Fsp (An' Feldspar (anorthite) (CMI2Si208)Ot.;: Ouartz (Si02)Po Pvrrhnlile (Fe51

a e o e roc analyses co cu a 0 rom a eSI()2 F8203 Neil I))() COi

--,-,--Nfl AI203 'ulal,~

50.15 0.93 1.08 4.50 41.58 1.76 100I'L.

A3 51.54 0.6\ 0.61 2.55 44.26 0.44 100AS 45.86 0.63 0.65 2.70 44.88 5.28 100A(, I G.95 0.64 0.40 1.65 50.45 2992 \00A7 SO 13 0.82 0.65 270 43.95 176 100AI.)

I5192 0.36 0.25 105 46.42 0.00 100I

-~-

.l7~ (.

I •• •

IIIIIIIIIIIIIIIIII'.

Wollastonite Concentration

732019

29th ~ 1988cl""l"I.l"\e.

%

55.0

51.9

2. J

0.9

2.8

40.8

0.9

99.6

Launceston Office:

Chemical and"MetaliurgicalLaboratory ,287 Wellington Street,LAUNCESTON 7249

Mr. J. Scales

2nd Batch

92.6% Minus J8 ~m.

Attention

R886

Tasmania

Ltd,

DEPARTMENT OF MINES

Telephone, (003)i:44 2.431L .

The comparative analyses and yields are as follows:

51. 8

Dear Sir,

Results agree extreijAely well. The concentrateis essentially of the same composition as the one previouslyprepared. Yield of Wollanstonite product is slightlyhigher.

Tasmania MinesP. O. BOx 815Burnie 7320

1st Batch

Item °h

5i0 2 51. 8

Al 2 0J 2.4

Fe 2 0J 0.8

MgO 2.7

CaO 41.1

L.a. I. 0.6

Total 99.4

Further to our previous report on the project,a further quantity of Wollanstonite concentrate has beenprepared by the same methods as previously by MetallurgistK. Austin, i.e. fine grinding, magnetic separation andflotation.

Product Yield

Feed Grinding Sizing:

The slig·ht.)y higher yield. in the second bat.ch isdue to a shorter flotation time for calcite removal.This also probably accounts for the slightly higherignition loss due to a little more calcite remaining in theproduct·

EnqUiries:Phone:Your ref.:Our file:

TASMANIA

-:IIIIIIIIIIIIIIIIII

IIIIIIII

732020

- 2 -

A fusion point determination was made on the product uS1ngthe heating microscope, with the following results.

Fusion Point

Softening Point

Small test pteces were made and fired 1n the electric mufflefurnace at 1000° for 6 hours.

Surfaces of the fired test pieces showed a slight pinktinge almost certainly due to oxidation of the contained lron.

Superftcial fritting occurred - the test p1eces werequite fragile.

A sample of the Wollastonite concentrate estimated tocontain about 75% Wollanstonite. (See previous letter re mineralanalyses), and a fired test piece is enclosed for your examination.

A more comphrehensive metallurgical report on operationsand results to date is being prepared by Mr. Austin. Thiswill be forwarded shortly.

IIIIIIIIII

•

Note: Please refer to our letter of 13th April 1988, paragraph 4,line l.

Correct "Yield- from 75.4% to 51.8%.

The figure 75.4% should refer to calculated Wollanstoniterecovery from total estimated feed content of the mineral.

Yield refers to recovered mass of concentrates.

Yours faithfully,

(P.L. Ja Sf

Chief Chemist & Metallu

I r

IIIIIIIIIIIIIIIIIII•

20

E.L.17/68

ANNUAL REPORT

APPENDIX 8

732021

l~

IIJII]

I~JII]IIJII]II]II]

]

]

]

]

JJJJIJI-

,. 21 732022

SUMMARY REPORT

ONPRELIMINARY TESTS

RE.UPGRADING OF WOLLASTONITE ORE

FOR

TASMANIA MINES LIMITED

BY

TIlE MINERAL SANDS CONSULTANCY

N.DAWSON.

SEPTEMBER 1988

P] r

rJ

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]

]

]

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]

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I

-.II i

.~

22

CONTENTS

1. INTRODUCTION

2. TEST PROGRAMME

2.1 Crushings

2.2 Wet Magnetic Separation

2.3 Flotation Tests

2.4 Additional Magnetic Tests

3. DISCUSSION OF RESULTS

3.1 Positive Results

3.2 Negative Results

4. RECOMMENDATIONS

APPENDICES

I Previous Data

II Mineralogical Assays

III WHIMS Tests Data

IV Float Test Data

732023

Page No.

1

1

1

1

3

4

4

4

4

5

7320241.

The - 300 micron material was passed through a Wet Hi.gh

Intensity Magnetic Separator IW.H.I.M.S.1

2.2 Wet Magnetic Separations

An initial crush to 100% - 300 micron was done by

Fox-Anamet Laboratories in Sydney.

2.1 Crushings

Hence, these preliminary tests were aimed at assessing the

possibility of producing a Wollastonite Concentrate by

utilizing a grind coarser than the 20 microns ex~ressed

in the initial Mineralogical work.

The Test Programme, as conducted, is described in the enclosed

diagram - refer Fig. 1 , Page 2

TEST PROGRAMME

PreviQ$ Mineralogical Studies by the Department of Mines in

Tasmania (refer Appendix II showed thac on two out of three

of the ore samples examined) the Wollastonite and in particular

the Calcite contaminant had average grain sizes 800 and 350

micron respectively. On the third ore sample all minerals

were stated co have an average grain size of 50 micron.

The following describes the tests conducted and the resultant

data is discussed.

The objective was to produce a high grade, !90%, Wollastonite

Concentrate. A number of techniques were discussed ie

fine grinding, magnetic separation, flotation etc. as being

applicable to achieving the production of a concentrate.

As a follow on to discussions with Mr. C. Whitehead of

Tasmanian Mines Limited a 5 Kg sample of Wollastonite Ore

was submitted for Upgrading Tests.

2.

23

1. INTRODUCTION

,.

]

]

)

J

?I

MAC,S.

MAGS

cJi.lJA2TZCtrAlC.

'( 32025 z.

WtJLLASTt:JIr'JTE CaNe.

ItJO-OO WTtWITS

,f'tJ!.t.}; CJl:tlS".JIIN6TO - 300 /-'-

ItJO ·{)O

2 ~TA{,E . WETiF7$! -..

MAGNE:"TIC

SEPARATloA!3·";'6 --

N/MA6SE:.o;'.sS

r51!/ND· TtJ15CJ.fi!'-

95·50;'

/11-7'2 _

ANIONIC..

FLoAT

I £t:J·7tl -..32·{)S""

CA rlcil.!I c. 7033 -..cLa/lT -,

24-72

MA6.NErTC .,S.71 -..cEPA~AII(J;,/

#/MA6f 2/:01

r

J-]

25

2.3

7320263.

The non-mags from the 1st Stage was repassed through

a 2nd Stage. The 2nd Stage WHIMS non-mags represented

95.55% by WT of the original feed. Refer to Appendix

III for WHIMS Test data.

This 2 pass WHIMS step reduced the Total Fe as Fe2

03

from 0.79 in the feed to 0.186% in the 2nd pass WHIMS

non-mags. This Fe level is within the Product

specification as given - refer to Appendix I.

Flotation Tests

The 2nd Stage WHIMS non-mags was forwarded to Amdel

for flotation tests.

This step was adopted as a follow on to Mineralogical

assessment of the WHIMS non-mags by W. Fander - refer

to Appendix II . This assessment advised that the

Calcite content of WHIMS non-mags was 70% with

Wollastonite content being 30% (maximum).

Amdel utilized a two stage Flotation Approach. The

WHIMS non-mags was ground to 100% minus 150 micron.

An Anionic Float was used to reject the Calcite followed

by a Cationic Float to reject the Silica/Quartz ..

The aim was for the Cationic Float Sinks to be enriched

in Wollastonite.

These Flotation tests produced a Wollastonite concentrate

which by Amdel's assessment contained 57.56% Wollastonite

and 70% Wollastonite by W. Fander's examination.

The main contaminant in.the Flotation concentrate

was diopside.

Amdels Test Report is enclosed in Appendix IV,

. ,,'..;

3.

7320274.

2.4 Additional Magnetic Separation Tests

In an attempt to reduce the diopside content of the

Float Cone. further Magnetic separation tests were

done. The small size of samples available, at this

stage of the test programme restricted these separations

to dry magnetic.

Although a 15% Weight take to magnetics was made

the resultant "non-mags" from the Float Cone. still

contained 20-25% diopside - refer to Mineralogical

Report in Appendix II.

DISCUSSION OF RESULTS

The results obtained from this work showed some potential.

for the upgrading of Wollastonite contents in the are sample

submitted. In particular

3.1 Positive Results Obtained.

a. Significant reduction in Fe levels by Wet

Magnetic Separations.

b. Promising rejections of Calcite and Quartz by

Flotation technique even at a relatively coarse

(150 micron) grind.

3.2 Negative Results Obtained.

At the 150 micron grind composites of diopside mineral

are still present in the Wollastonite concentrate.

These could not be significantly reduced by Magnetic

separations.

Grinding finer, for diopside liberation, in particular,

is clearly necessary.

RECOMMENDATIONS

This work should be conducted at Amdel in Adelaide with the

final WHIMS tests done by Readings in Lismore.

5.732028

b. Once a. is established, then to conduct Flotation

at this grind, and proceed to use WHIMS on Float

Cone.

a. Conducting a number of grinds to various micron

sizes and conducting WHIMS separations to

assess the coarsest grind which will allow the

majority of the diopside to be rejected by WHIMS.

Provided Market conditions warrant, and assuming significant

tonnages of ore exist, then further Metallurgical work should

be directed towards

Although the work conducted did not produce a +90% Wollastonite

Conc. some of the results obtained were promising.

Based on the above observations a conceptual treatment

flowsheet is described in Fig. 2, Page 6 . This flowsheet

requires further development.

4.

tJR£

c:RUSJ/IN6.

1

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Af//tJf//C / CATldN/C -FioATAlliJlfI ClPColT -

2 $U6£-W.-;tJ:M: S. -Cl~C:C/JI

-"IjJ.lACS

WOLLA STCIN/TE: CaNe.

S/;vf[S/('AIC!TJ~GJ.TZ .

MA65". LJltJ?S/LJE

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APPENDIX II

Mineralogical Assays

732030

_MJ"j ~.f f}-)., () CJ Cfl-~ 11/1/ f9..i-:YJ./~

()rftjJrp~~L ;s).., ?4,,:J,/. ~c

REPDRT CMS 88/9/10

9th September, 1988

"Wollastonite '!

Mineralogy

N. Dawson

H.W. Fander, M. Sc.

5th September, 1988

Purchase OrderNo. 262

\10RK REqUESTED:

SUBMITTED BY:

YOUR REFERENCE:

SAMPLE NOS.:

DATE RECEIVED:

Mr. N. DawsonMetallurgIcal ConsultantThe Mineral Sands Consulta~cy

Suite 3Sunnybank Woods Shopping Centre210, PBdstow RoadEIGHT MILE PLAINS / OLD. 4123

Central Mineralogical Services39 8eulah Road. Norwood. South Australia 5067Telephone (08) 425659 Fax (08) 363 1820International Telephone + 618 425659 Fax + 618 363 1820

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8xamlned.

non-maonetIC.

SAMPLE REPORT (Mineralogy, Petrology, Ore Microscopy)

A small trace of pyrite occurs as fine inclusions in the silicates.

IDENTIFICATION

'7 3 2 0 3 2 9th September, 1988·Dale _..:....:._=~==-'--'-=_

Dale Racaived: __5::...:...9:...:.... .:..19:...8=8 _

Purchase Order No. 262

The dl0psicte is a colourless, very low-Fe variety, and is very probably

Diopside is present as very irregular grains, and about half is composite with

wollastonite in varYing proportions; half occurs as free grains in the

10 um to 120 um range, mostly around 50 um.

The sample consists of approximately 65 % wollaston1te, 25 % diopside, 7-10 %

carbonate and 2-3 % quartz.

b. Micro,cople:

A portion of the sample was mounted in an R.I. oil of 1.63 and microscopically

Almost all the carbonate occurs as 5-30 um inclusions in wollastonite and

diopslde; some of the quartz 1S free, as single grains and fine-grained

aggregates, and some forms small inclusions in wollastonite.

DESCRIPTION

a. Hand Specimen:

Sample No. __"_W_o_l_l_a_s_t_o_n_1_t_e_'_' _

Nalure of Sample: __:..F.:::.l.:::.o.:::.a.::t.--:::C.::o.:..nc.:.--.:.N:.::o::.n:...--.:.M.:.:a:;9"s;;.:... _

SECTION No.

Job No~_C_M_S_8_8_/_9,--/_:O__

Re'erence

About 50 % of the wollastonite is free or substantially fTee (i.e. with only

__ a few small inclusions of quartz and/or carbonate); the remainder contains

substantial numbers of inclusions or forms composites, generally texturally

complex, with diopside.

, CENTlJ'l MINERALOGICAL SERVICES- [JI []I - ]

I , ]~

I ~

JI JI JI ]

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I []I [JI []I [JI ]

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IH.W. Fander, M. Sc.

~J

I LJI []I J. ......,

15th July, 1988

N. Dawson

Mineralogy

j~O-r_~ ,H.W. Fander, M. Sc.

"Wollastonite"

13th July, 1988 (sample)

Order No. 129Facsimile Message 12.7.1988

WORK REQUESTED:

YOUR REFERENCE:

SAMPLE NOS.:

SUBMI TTEO BY:

D~ TE RECEI VEO:

REPORT CMS 88/7/14

732033

Hr. N. DawsonH. & N. Investments Pty. Ltd.The Mineral Sands ConsultancySUIte RSunny bank Woods Shopping Centre218, Padstow RoadEIGHT MILE PL~INS I OLD. 4123

Central Mineralogical S3rvices39 Beulah Road. Norwood. South Australia 5067Telephone (08) 425659 Fax (08) 363 1820Internationol: Telephone + 618425659 Fax + 6183631820

32

(

~Fander, M. Sc.

rhe product was examined as received, using specific immersIon oils.

lI'Wollastonite llSample No. ~:;..::.~~..:....: ....:.........,. _

NBlur. of SBmpl.: _~Fc..:.lo::...t~.::a..:t..:i..:0c-n,-,=C:.::o::n:.::c:.:e:.:n.::t:..:r:.:a,-t::;e::- _

IOENT1ACAT10N

'7 3 2 0 3 4 Dale _1_5_t_h_J_u_l.:..y.:...,_1_9_88 _

Trace

20 %; granular, often with minute opaque inclusions.

70 %; clean, thin crystals and needles.

1-2 %; clear grains and cloudy masses full of inclusions.

8-10 %; mainly diopside, with carbonate, quartz, wollastonite.

SECTION No.

Sulphides

Composites

Free quartz

Free dlOpside

Free wollastonIte

The presence of diopsLde in this sample, and its absence in the previous sample

(CMS 88/5/30), suggest that it is weakly magnetic, presumably due to the

inclusions; the cloudy masses of quartz may well be magnetic also~

H,ner81 percentages are difficult to deter~ine with accuracy because of the

very different shapes of the mineral constItuents, but approximate percentagas

are as follows:

b. MIcroscopic:

B. HaM Specimen:

DESCRIPTION

Relerence

CENTRAL MINERALOGICAL SERVICES

33SAMPLE REPORT (Mineralogy, Petrology, Ore Microscopy)

Job No. [MS 88/7/14 Dale Race;ved: 13.7.1988P.O. No. 129

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732035

0"1 RICllvl<:\: __3::;0;;.;.;'5~.~1c::9..::8::::8 _

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eMS 88/S/30

~ .6(~ e e j~ u <;> : 2 121 @

lENTRAL MINERALOGICAL SERVICES

@J~,, ]SAMPlE REPORT (Mineralogy, Petrology, Ore Microscopy)

,.,.

. 9.mpte1llo. "Wolh~tonite"JN.Me 01 ••~: _

,,,"CIIlIJOTlOM

• ] a H. f\d &;>.o111l9'11

H.W. Fander, M. Sc.

The ~8mpla conai~t~.of st least 70 ~ calcite, and no mOre than 30 ~ wollaBtonite.

WIth a trsce to 1 ~ of Bulphides\ the minerals are dominantly frse, but there

ar. celcite-wollastonite compoeitea.

The sulphides ere fine-grained (1-100 urn, moatly < ~O urn) and are frea end slso

occur as inclueione in calcitel they consist of pyrita, aphaler,te, poaaible.

chalcopyrite and 7ga1ene.

300 urn -up to

only

mounted on slides, lI6.ln" c1iffsrent refrBctive

grainei~e~ ranged from 1 Ulll

eBtimate" were not pOBsible, and figurBs 9iven areth.JS qUBntitative

approdmete.

In order to meke a more accurate ectimete of the mineral~ present, a portion

of the Bampls was trested with Hel to remove calcitef however, wollastonite Ie

.1'0 eomewhst soluble snd thus calcite could not be dissolved wIthout the danger

of losing ~ome wollastonite. The SGe of the two minerels Bra feirly close also,

.nd clean sops ratione on that beaia would be questionable. Quantltetive XRD or

OrA/TGA may be more successful in providing more accurate data, and ~02 assays

could be uaed to calculate the amount of calcite preaant, with wollastonite

obt.ined by dIfference (this only applies to thia particular esmple, which

con5ista eaaentially only of two minerala).

)J,IOIO~p;o:

Representative portions of material were

Index ollel the Illeterisl is 1JT15ized, end

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,

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35

APPENDIX III

WHIMS Tests Data

TO I _;.;N.::O:.:L~A:.....:.I:..;.1J.:.N~Eo::S::_ NUKBll. R •__---"():.!.7.;;·~(l4::..1l.i1'_1;6~6~Fi _

CLr EN'!' f1 LE , __..:H::...;&::;;,._N:.'-:..:IN::...V~E:::.S.:.T.:::.M:.;;E:.:.N::.T:.:S;;.· _

The semple received by RC8dl"i":" "ftcr consutt~tion wllil Neil Dawson was processed thru" Reading,; WHl MS wlLIl the objective of allail1ing maximum extraction of magnetics. Thisw~s done by retreJting the 11011 magnetics. The Lestwol'k procedure call be ",on below,along with percent WeiglLLs obtained i:I[ound lIlls circuit.

Total FIl.

21 7451REAOO21 9384

732037

(066)166156(066)

0,79%

SLJM~:S

PAGES INCLUDING THIS ONE.

FACSIMIIoS SHE£T

TELEPHONE,TELEX.FAX.

OATIi: J ---'3"-lU/.;J.51../S"'S"-- _

TOTM. OF

NON MAGNETICS9S,5St

100.00%

Tl

WHIMS

N/M

97.33%

.,.

96,54'1',

T2WHIMS

A;; RECEIVED SAMPLE

PTY LTD

WOLLASTONJTE SAMPLERE:

MAGNETICS2.G7%

R~ADINGS Or LISMOREB COOl(' STREETSOUTH. LISMOREN.S.W.2480

~CNETICS

0.99%

RE F NO I __....:.:.R;,.L_-...',{"-"'b"'"L-"c2'--__

ME6SAGE,

FROM I EUGENE DARDENCO

,PLEASE C~L I~ AN¥ PAGES NOT RECEIVED.

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1[J: Sdmples of head feed 8nd final non magnetics have been sent for chemica! ,,"says -I rJ ,"J,Q h::wc ,;ent the non magnetics for mineraloi\Y. To date. no assays are available.

i Regards,

I~] fr1n ~. OI\ROC:NGO

,- P.~OJECT METALLURGIST

1M

-

0'

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,.~ il. . I 'JI,); '. ,. I t ~_...

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LABORATORY REPORTCONSULTING ANALYTICAL CHEMISTS

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APPENDIX IV

Float Test Data

732039

Address all correSPondence to:p,O, Box 114,Eastwood, SA 5063,Australia

732040

Telex AA82725FacSimile: [08) 352 8243

Wollastonite Ore

Purchase Order No. 242

2907 Test 2 N/Mags

AmdelInternational Operations Group

OSman Place.Thebarton, SA 5031

Te1epnone (08) "35733International' "618435733

~, 8., .....v

'25 .July 1888

OD 3/0/0-06749

Sydney, Melbourne,Perth, Canberra, Darwin. Townsville, Represented world-wide,

'!r, N, DaCfSonConsul tant

Th" Mineral Sands CDnsul taneySuite 3, Sunnybank Woods Shopping Centre218 Padsto~ RoadEight Mile Plains8RISR~VF. Qld 4]23

YCUR RnTRfNCF

1DEJ'rf'I FICAT ION :

,'1ATERIAL:

LCCATION: Tasmania

[nv"stlgatlOn and Report by: /1"/ I.W. McPheat

rl>n"ral I~er, International Operations Group: Peter M. Cameron

'~R~ REQUIRED: Flotation testing,

1]1I.J~

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732041

.\ single flolntlon tp.st. \.-Jas cnrrled out on a snmple of wollastonite ore',;hich 11Fln l.:;.een trel:it.f-~d by lnagnetic separation to remove iron-!:::>earingIII I. nprrlls.

['he :pst proc(edure emrloyPd Brllonic flotatlon to remove calcl te, followed by~';-lltonlC f1oL9.lion to n:~move quartz and some silicate minerals.

i'h~ \....lullfisLnnJ,le conU~nt.s of the flotat.ion prooucts ~ere calculated from CO2

and aCId soluble calcium assays. Although the precision of this technique!leeds to be verified for t.he ore sample tested, the results indicate that! he siiI71ple was upgraded from a feed grade of 22% wollastonite to ar~oncentrtlte grade uf 57% wollastonite, for a. -wolla...gtonite recovery of 66%.

! N'ITXJlllCr ION

"IDfATION TESTING

r-LDTATlCN or- WOLLASTONITE ORE

anionic

The pulp wasand then with

were carried out using anI tall oi 1 fa tty =1(1'0) .

F1 LA. lon

~nionlC FlaLation.._--.- ...._- --,-----"------_...

'2.2 ::-2tL

?-l '/E' st.::tges of' rou.gher flot.ation,,>llt-'<"_·\.nr l bH_Sf-:<l on I\cint.ol FA-l

'nlOnic flolalion WRS carried out without pH adjustment.""no it. i oneel "j t.h sodium 81 licate to depress wollastoni teCp.-LCll1rn chlorjde t.O 8clivFile quartz.

Tn" roH of lne a.momc 1411ing was adjusted to 4 USing sulphuric acid andthr~e sr?ges of rougher fLot,ation carried out using the collector FlotigamC":" (coconut fatty ~mine .3.Cp.tate).

i'hp flot..ation condJ tlons are given In Table 1.

732042

The composItion of the collector is given in Appendix A.

Crind Lng and flot.atlon were carried out using distilled water, Adelaide(1V1 \ n.~ WAt.er l-rtS usr~ ror the desliming, and the deslimed material was WB.Bhed\ 'Il,~r' \_irne:-'-i em .':\ V[lC'.ltJm filter with distilled water.

~'he::' cJienl requesl.ed t.h[l.t. a single preliminary t.est be undertaken to examine!.ne rlot.aticm response of the sample using a feed grind of 100% passing. c; 0 ~lIn.

Ca tion LC flotB.t.lon \..;as undertaken on the anionIC flotation tailing to removeqUFl.rt7. and. somp SIlicate minerals as the froth product.

:-~:;\ t.he oosis of the above ass1....IJT1€'d minera.logical com-posi tion a flot..a.tion test'-"(.1S tJrxJerwKen uSlng a 1000 g feed charge stage ground to the requested~lze, The ground material ~s deslimed, using a 50 mrn dia cyclone.

"".~ Lhp timF: n!' tF~sting, lltt.le was known. about the mineralogical compositionif the sHmplf:', but i.t. \....iR.S H..ssumed that the major ga..ngue minerals present"~'en::~ c:nlr.:i tE::: H.nd qU8.1~tZ. The validi ty of t.his A.ssumption 1;..Ifl..8 not confirmedi"""cause 0 f' thf" c I j en t 's doubt.s concerning the representi vi ty of the ore":';-L11).") ll~ .

.... ~ruT1p)8 of' 'rJolJast.nnite ore Wf\S rece)vro for t~sting. ThIS sample hadprp\'\()llsly t".oP.p.n If"p.l\(,etl by ma.gnetic sepuration to remove iron 'be:aring:111 rlp.r.q Ls.

42732043

Thp test proollcts wen~ assayed for acid soluble C".....a and for CO2' The results

r1n~ shown i.n Appendix B.

fhr: wollasloniLe a.nd r::.a.lclte concentrations were calculated a.ssuming thatclIleite ...F\8 the only CrirOOnBte mIneral present., t.hat \.Jollastonite is acidsu 1\Jhlp. ru1d that l..Ollnstoni te and calcl t.e were t.he only acid soluble calci\..IrnrOll\cr2l1 S prp.5p.nt..

Th(: n.r! La t_ I on t.es t. cesul t.s are shol,..,ifl in Table 2. Based on the assumptions~t.lpulllt.eJ abov" , the flotation feed (before desliming) contained 22,5%w()llastonile ~d 42.9% calcite. The wollastonite concentrate (cationicLH,lingJ contElned 57.6% wollilstonite and the corresponding wollastonite:F'<";overy WfLS 66, J%.

CaLcite removal hy arHonic flot.atlon was good.

r l should be flO led Lha t the wollastoni te content of the Anionic RougherConce.n t.T<'l te 1 and 2, calculated from the CO2 and acid soluble Ca assays, "'lll

-12 ..1%. H. '5 evident from this result that the analytical procedures used~no the aSSL~ptlons made concerning the mineralogical composition of the orenePd to be veri fied.

l.Jnt.il a confirmed analytical technique for wol1.astonite determination isaVRilable ~_he accuracy of the results presented. in this. report cannot 'be~ 1.1_ pulFl t.ed and the resul t.s should 't::>e used wi th caution.

3.0

58.2

38.8

Weight %

t Cetyl phenol ethoxylate.

APPENDIX A

"lnto) FA-l (udl 011 fatty acid)

The above. mixture ....-as diluted. with distilled t.."ater to prod.uce an emulsion~nnlRining ~% w/v of the above consituents.

l'~rrlC X-IOJ (emulsifier)

The anIonic coLlector hBd the following composition:

43I] :i (I] .J

IJ .J

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IJ'II],:

I].,

1--\.,--1].1

10:;IlI

APPENDIX A•....__ ..•.....•_.,.--_.-._ ..~

,-- ,,~"~l':L__~._,' "__ _Ca (acid sol) OJ

2

732045

ASSAY OF FLOTATION PRODUC'ffi..... - -_..- - - -._ -

.. _----'-~~-'-------_._-----_ .._--_._--------

C",'1tJ onlC 110 '1'",1 20.3 0.48(:..FlLJonic Ro Cone 2 + .1 11. 1 0.09Cationic Ro Cone 10.8 0.21.f\n 1On Ie fio ronc 4 + 5 11.6 5.8';nlOnJC flo Cone 3 28.0 27.3AnionlC Ro Cone + 2 30.0 37.6SlirnfJS

25.1 20.3

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Time nllll DH REAGEN1' ~l)U!T10N. k~/[

Condit. FJotatlorl 11250,1

0.025 2.30.025 0.7

0.025 or ..

FI.OT [(;<11-1

CA

0.50.250.250.250.25

ANIONICCOLLECTOr,

0.5

CALCIUM

CIILORIDF

SO\)IU~

SI LJ c,nE

'II UC

0.075

9.6

9.3

9.08.78.58,3

5,05.050

3

33

32

1 -1 / 2]

1

21

33

3

3

3

33

3

HOLJeher 1Rougt1er 2

Roue-her 3Rou"her 4Rougher 5

f\njulJic Flotation

Cationic FlotationRoul!.t1er 1Rougher 2ROU2'her 3

... Not recorded

- - - - -- - - - -- - - - - - - - - --

CALC

732047

',OllCALC :;WOll I.

'ASlE 2: ~ESUlTS OF WOllASTONITE FlOTATON TEST 1

IJNT01. r-·~F'

>~ ,::0 "7" ~ 1 1 ~5.88 2:\.88 57.56 57.56 1,09 1,09 66,2° 66.29 0.66 0.66~ -=' '. '=0(,( 2+:3 5,41 Jl.2? 31,93 53.1:; 0,20 O.9~ 7.68 73.'17 0.03 0.682t F:::. C-'J~,C 1. :'6 33,55 30,74 51.62 0,48 'J.91 3.09 77.07 0,03 0.71,

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