| Lat / long: | 33.0776, -109.29343 |
| Primary: | Manganese |
| Ore: | Psilomelane, Pyrolusite |
| Orebody form: | IRREGULAR |
| Discovery year: | 1906 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Producer |
| First production started: | 1951 |
| Host rock: | Longfellow Limestone |
| Host type: | Limestone,Chert |
| Associated rock: | Precambrian Granite-Granodiorite Complex |
| Associated type: | Granite |
| Structure: | Ne 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: | Deeply Sunken Limestone Fault Blocks East Of Copper King Massif; Vertical Throw Of About 3000 Ft |
| Alteration processes: | Manganese Ore Occurs As Replacement Of Limestone Bordering Large Fault; Replacement Of Crushed Chert Particles In Brecciated Areas |
| MRDS | M800416 |
| DEP | 10109875 |
| Reference | {Deposit:: USBM IC 7990, P. 101-102.}{Deposit:: USBM FILES, BLACK ROCK GROUP.}{Deposit:: ABGMT CLIPPINGS FILE, BLACK ROCK MINE.}{Deposit:: USGS PP 43, SAN FRANCISCO RIVER GEOLOGY COMMENTS.}{Deposit:: 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.}{Deposit:: ADMR FILE DATA, BLACK ROCK MINES.}{Production:: USBM I.C. 7990, P. 101.} |
| Reporter | Calder, Susan R. |