| Lat / long: | 39.43813, -76.92997 |
| Tertiary: | Cobalt, Copper, Iron |
| Other material: | Actinolite, Bornite, Calcite, Carrollite, Chalcocite, Chalcopyrite, Chlorite, Covellite, Epidote, Gahnite, Hematite, Limonite, Magnetite, Malachite, Pyrite, Quartz, Siegenite, Sphalerite, Zoisite |
| Operation type: | Surface-Underground |
| Development status: | Past Producer |
| First production started: | 1749 |
| MRDS | W017504 |
| MAS | 240130004 |
| DEP | 10242703 |
| Reference | {Deposit:: BUREAU OF MINES, WAR MIN. MEMORANDUM, MINERAL HILLS MINE, CA}{Deposit:: CO, MARYLAND, REGIONAL FILE NO. E 296, FEB 1943. (CONFIDENTI}{Deposit:: CONFIDENTIAL WAR MIN REPT FILE, MISC. REPTS, MINERAL HILL MI}{Deposit:: CARROLL CO, MD.}{Deposit:: ESPENSHADE, GILBERT K., REPT. ON MARYLAND COPPER MINES AND P}{Deposit:: S, USGS, AUG 13, 1942 (CONFIDENTIAL) P.6.}{Deposit:: HEYL, ALLEN V, AND PEARRE, NANCY C, MD BOARD OF NAT RES MD G}{Deposit:: SUR BULL 28, 1965, PP 66.} |
| Reporter | Sapakoff |