| GMRAP ID | 9639 |
|---|---|
| Alternate names | Big Onion, Larsen |
| Tract name | Intermontane Island-Arc Cu-Au (003pCu2002x) |
| Group name | Afton-Ajax Group |
| Included sites | Group includes Afton, Ajax JV, Big Onion, DM-Audra-Crescent, Galaxy, Iron Mask, and Rainbow deposits and Ace, Admiral Dewy, Crescent, Fargo, Kimberly, and Python prospects. |
| Site status | deposit |
| Country | Canada |
|---|---|
| State or province | British Columbia |
| Geographic location | -120.436715385, 50.662805988 |
| Geologic map unit | -120.436715385, 50.662805988 |
| Nearby data |
| Deposit type | Porphyry copper |
|---|---|
| Deposit subtype | Cu-Au |
| Age (Ma) | 205Ma |
| Age determination method | U-Pb zircon |
| Age range | 205 Ma |
| Age reference | unknown |
| Minerals | bornite, chalcopyrite, magnetite, pyrite |
| Associated rocks | diorite, picrite, diorite breccia, monzonite |
| Tectonic setting | island arc |
| Stratigraphic age | Late Triassic |
| Development status | Prospect |
|---|---|
| Major commodities | Cu, Au |
| Tonnage (Mt) | 3Mt |
| Cu grade (%) | 0.71% |
| Au grade (g/t) | 0.44g/t |
| Contained copper | 23,000t |
| Gold-Moly ratio | -9999 |
| Study area name | British Columbia and Yukon Territory |
|---|---|
| References | MINFILE BC (2009); Sinclair (2007) |
| Site reference | Mihalasky and others (2011, revised 2013) |