| Main commodities | Cu |
|---|---|
| Ore minerals | chalcopyrite; pyrite |
| Gangue minerals | quartz |
| Quadrangle map, 1:250,000-scale | IL |
|---|---|
| Quadrangle map, 1:63,360-scale | A-5 |
| Latitude | 59.2389 |
| Longitude | -154.7059 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This approximately located occurrence is at an elevation of about 2,250 feet approximately 1.5 miles northeast of the east end of Mirror Lake. It is near the center of sec. 8, T. 11 S., R. 32 W., Seward Meridian. The location is uncertain; it is based on a description by Mather (1925, p. 172), which correlates fairly well with the geology mapped by Detterman and Reed (1980). The lccation is probably accurate within about 1 mile. Mather (1925) also noted mineral deposits closer to the east end of Mirror Lake. |
Geologic descriptionThe country rocks at this site are mainly Tertiary volcanic strata that rest unconformably on Jurassic granodiorite that underlies much of the headwater area of Funnel Creek above Mirror Lake (Detterman and Reed, 1980). The granodiorite has a lobe-like western projection into the head of Mirror Lake. Mather (1925) believed that the granodiorite intrudes the Tertiary volcanic rocks, but it probably intrudes only nearby Jurassic or older rocks (Detterman and Reed, 1980). The volcanic rocks at this occurrence reportedly are cut by abundant quartz-pyrite veins as much as several inches thick (Mather, 1925). Nearer Mirror Lake, and exposed in small creeks flowing into the lake, a swarm of pyrite- and chalcopyrite-bearing quartz veins as much as a half-mile across is in the Jurassic granodiorite and its metamorphic country rocks (Mather, 1925). | |
| Geologic map unit | (-154.70803165726, 59.238209902042) |
|---|---|
| Mineral deposit model | Uncertain. Possibly polymetallic veins or porphyry copper (Cox and Singer, 1986, models 22c and 17). |
| Mineral deposit model number | 22c?, 17? |
| Age of mineralization | The veins in the volcanic rocks are Tertiary; the veins in the granodiorite and metasedimentary rocks are Jurassic or younger. |
| Workings or exploration | No claims or workings are reported. |
|---|---|
| Indication of production | None |
References | |
| Reporters | C.C. Hawley, Hawley Resource Group, Anchorage, Alaska |
|---|---|
| Last report date | 6/10/2003 |