Black Diamond Mines Regional PreserveEast Bay Regional Parks

Northern California PEMA Field Trip/HikeThursday, October 30, 2014

William E. (Bill) Motzer, PHD, PG, CHGSenior GeochemistTodd Groundwater

bmotzer@toddgroundwater

http://www.ebparks.org/Parks/Black_Diamond

Mt. Diablo Coal Field1860-1906

NortonvilleSomersvilleStewartvilleJudsonville

West Hartley

Nortonville: ca 1880

Black Diamond

Mines Regional Preserve Trail Maphttp://www.ebparks.org/Parks/Black_Diamond

Total Distance: ~3.3 miTotal Ascent: ~680 ftTotal Decent: ~755 ftTime: ~2.0 hours

HIKE:Moderately StrenuousRAIN: Cancels HikeUNDERGROUND: OK

LOOP HIKE

Rosehill (Historic) Cemetery

GeologySullivan (2012)

Capay Shale

Sullivan and Sullivan (2007)

Domengine Sandstone• R. Marvin Greathouse: Hazel-Atlas Mine• Near old Somersville townsite• 1922-1945• High-quality silica sand

Greathouse Portal: Visitor’s Center

Coal Seam/VeinBlack Diamond Vein: ~4.0 ft thick

Inhabitants:Temporary

and Permanent

Recommend: When You

Go…

• Wear boots

• Take sticks

• Take water

• Pull-over/Jacket

Watch For…

• Ticks

• Rattlesnakes

• Pies

• Ixodes pacificus (Western Black-legged tick)• Active: November through April• May carry Lyme disease