mundiyawas-khera copper- gold-silver deposit, … · significance of mundiyawas-khera...
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Presented by
ISRAIL KHAN, Senior Geologist
MUNDIYAWAS-KHERA
COPPER- GOLD-SILVER DEPOSIT,
THANAGAZI TEHSIL, ALWAR
DISTRICT, RAJASTHAN
Team Members:
D.K. Rai
P. R. Sahoo
D. Boopathi
S. Mukhopadhyay
Mundiyawas-Khera
Copper-Gold-Silver
Khetri Copper Belt
Geological map of
Western Region
Mundiyawas-Khera area on Satellite Image
Panoramic view of Mundiyawas-Khera area
Mundiyawas-Khera Discovery of polymetallic deposit(Cu-Au-Ag) in the Ajabgarh Groupof the Delhi Supergroup.
METHODOLOGY ADOPTED
Systematic geological mapping
Geochemical sampling
Ground geophysical survey
Data integration
Detail mapping, delineation of mineralised zones
and planning of boreholes
EVIDENCES OF HYDROTHERMAL ALTERATION AND FELSIC VOLCANISM
Feldspar
Phenocryst
Embayed
quartz
ScapoliteMatrixScapolite
1 cm
Cp
Nature of subsurface sulphide Mineralisation, Mundiyawas-Khera area
Cp
Po
Stringers and disseminations of chalcopyrite (Borehole
KBH-2, 80.50 m depth)Chalcopyrite vein parallel to foliation and quartz vein
containing pyrrhotite and chalcopyrite (Borehole KBH-2 ,
89.0 m depth)
Fracture filled coarse grained chalcopyrite (Borehole
KBH-2,48.80 - 49.30 m)
Au= 86 g/t
Cu= 0.72%
Ag = 11 g/t
Chalcopyrite with arsenopyrite (Borehole KBH-6, 257.35 –
257.58 m depth)
Cu= 14.35%
Ag= 70 g/t
Au= 3.54 g/t
Asp
Cp
Cp
1 cm
Stringers and massive chalcopyrite, arsenopyrite and pyrrhotite, Mundiyawas
Block (Borehole MUBH-1, Depth: 201.80-202.40 m)
Cu= 12.0% , Ag= 40 g/t
5 cm
Borehole MUBH-1, Depth: 200.50-201.55 m, Cu= 11.0% Ag= 60 g/t
Chalcopyrite in association with
pyrrhotite hosted within the tremolitic
marble.
An euhedral arsenopyrite occurring
within the massive pyrrhotite (136.45 m
depth, borehole KBH-2)
Cp Po
Asp
PHOTO MICROGRAPH OF ORE MINERALS
Native copper
Native copper in the zone of oxidation
Au-Ag alloy occurring along a
chalcopyrite vein
Au-Ag alloy
Au-Ag alloy CpPoPo
Pent
Cub
Chalcopyrite (Cu ore) occuring as
dominant phase within the felsic
volcanic rock.
Minor pentlandite (Ni-ore) occurring
with the exsolved phase of pyrrhotite
and cubanite.
SALIENT FEATURES OF MUNDIYAWAS-KHERA COPPER-GOLD-SILVER DEPOSIT
Stratigraphy & Age: Thanagazi Formation, Ajabgarh Group, Delhi Supergroup,
Mesoproterozoic Age.
Geometry of the ore body:
Strike length : 630 m
Width : 100 m (cumulative)
Depth persistence : Over 200 m
Host rocks of mineralisation:
Felsic metavolcanic
Tremolite marble
Sulphide mineralisation: Chalcopyrite, pyrrhotite, arsenopyrite, pyrite, galena,
pentlandite and cubanite
Nature of mineralisation: Disseminations, stringers, massive and vein
Width of lode Grade
Copper: 2.0 m to 46.20 m 0.2% to 14.35%
Gold: 1.0 m to 5.50 m 0.5 g/t to 86.0 g/t
Silver: 1.0 m to 5.50 m 5 g/t to 70 g/t
Primary sulphides occur from shallow depth ~ 10 m to about 200 m vertical depth.
The mineralisation is stratabound in nature. RESOURCE
SIGNIFICANCE OF MUNDIYAWAS-KHERA
COPPER-GOLD-SILVER DEPOSIT
High tonnage and low to medium grade deposit
The occurrence of gold and silver mineral association (native
gold and Au-Ag alloy) make this deposit economically more
viable.
The high width of the ore body makes it distinct from all other
copper occurrences explored so far in Western India. High
thickness and proximity to the surface make this deposit
mineable by open cast methods.
Similar type of deposits are expected in other parts of Alwar
basin
The sustained mineral exploration program in the area will
further augment the copper resources of the country.
MUNDIYAWAS- KHERA AREA
• Khera Block (G-2)
Khera SE Block (G3)
Mundiyawas Block (G3)
ANGARI BLOCK
AGAR BLOCK
TEHLA-KHOH-BIGHOTA AREA
FUTURE EXPLORATION STRATEGY
THANAGAZI
The future belongs to those who can effectively and efficiently
prospect the concealed terrains
Thank you……
GSI Base camp, Thanagazi
Parameters
Value
(ppm)
Log inv
(ppm)
Mean (X) 132.522 71.61
Stad. Dev. (SD) 296.379 2.42
Minimum 10.000
Maximum 3200.000
X+SD 74.03 173.78
X+2SD 76.45 420.8
X+4SD 81.29 2471
Khera Block
Mundiyawas Block
Khera SE Block
GEOPHYSICAL SURVEYS CARRIED OUT AT MUNDIYAWAS-KHERA AREA
INDEX
Boreholes FS 2010-12
Boreholes FS 2012-13
Boreholes FS 2013-14
KBH-5
KBH-4
KBH-10
KBH-6
KBH-2
KBH-8
KBH-1
KBH-16
KBH-11
KBH-12
KBH-13
KBH-14KBH-3
KBH-15
KBH-17
KBH-18
Boreholes FS 2014-15
DETAILED GEOLOGICAL MAP OF KHERA BLOCK
KBH-7
KBH-9
SURFACE INDICATIONS OF MINERALISATION
Malachite stain in tremolite bearing
dolomitic marble
Malachite stain in felsic meta volcanic
(Rhyo-dacite)
Borehole KBH-1, Khera Block
SUBSURFACE EXPLORATION
Name of the
Deposit
Resources
(MT)
Grade Metal
content
(tonnes)
Cost
( Rs. in Cr.)
Khera Block
(FS 2010-14)
30.57 Mt Cu ore
1.96 Mt Au ore
2.33 Mt Ag ore
0.35%
0.69 g/t
7.28 g/t
106995 Cu
1.3524 Au
160.962 Ag
4117.07
359.31
618.01
Khera South
East Block
(FS 2013-14)
3.28 Mt Cu ore
0.11 Mt Ag ore
0.76%
5.0 g/t
24928 Cu
0.55 Ag
959.35
2.11
Total 33.85 Mt Cu ore
1.96 Mt Au ore
2.44 Mt Ag ore
0.39%
0.69 g/t
7.18 g/t
131923 Cu
1.3524 Au
161.512 Ag
6055.91
MUNDIYAWAS-KHERA RESOURCE