Description
Del M Potter (Owned Property From 1906 To 1949)
Commodities
PrimaryManganese
Commodity typeM
Deposit
Deposit sizeS
WorkingsSurface/Underground
Orebody formIRREGULAR
Ore controlManganese Occurs Within Relatively Thick Bed Of Chert In The Longfellow Limestone; Ore Bodies Border Large Fault Between Contact Of Chert And Limestone
Materials
Ore mineralsPsilomelane, Pyrolusite
Geology
Host rockLimestone,Chert · Longfellow Limestone
Associated rockGranite · Precambrian Granite-Granodiorite Complex
StructureNe Trending Large Fault Between Limestone And Precambrian Granite That Comprises Massivebluffs Overlooking The San Francisco River, Upper Contact Of Chert And Limestone Is Very Irregular; Most Ore Exposures Are Located On The Canyon Walls 20 To 40 Ft Above The Bed Of The Gulch
Tectonic settingDeeply Sunken Limestone Fault Blocks East Of Copper King Massif; Vertical Throw Of About 3000 Ft
AlterationManganese Ore Occurs As Replacement Of Limestone Bordering Large Fault; Replacement Of Crushed Chert Particles In Brecciated Areas
Economic & production
Development statusProducer
First production1951
Discovery year1906
Identification
Deposit ID10109875
MRDS IDM800416
Alternate namesBlack Magic Prospects
RegionNA
Data scoreB
Coordinates33.0776, -109.29343
References
USBM IC 7990, P. 101-102.USBM FILES, BLACK ROCK GROUP.ABGMT CLIPPINGS FILE, BLACK ROCK MINE.USGS PP 43, SAN FRANCISCO RIVER GEOLOGY COMMENTS.BENNETT, K.C., 1975, GEOLOGY AND ORIGIN OF THE BRECCIAS IN THE MORENI-METCALF DISTRICT, GREENLEE COUNTY, ARIZONA: M.S. THESIS, UNIVERSITY OF ARIZONA, 153 P.ADMR FILE DATA, BLACK ROCK MINES.USBM I.C. 7990, P. 101.