Broken Shovel Prospect, Aniak Mining District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Broken Shovel Prospect | Prospect |
| Aniak Mining District | Mining District |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
60° 48' 21'' North , 158° 50' 27'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Broken Shovel prospect is in the headwaters of an unnamed, north-flowing drainage, 0.5 mile northeast of upper Cinnabar Creek (TA001) and 3.5 miles southwest of USGS benchmark Prom (2,709 feet elevation). The map site is at an elevation of about 1,250 feet, in the NE1/4 of section 12, T 8 N, R 55 W, of the Seward Meridian. The deposit is exposed on the northwest flank of a small ridge separating headwater tributaries to the north-flowing creek; the westernmost of these tributaries is locally called Broken Shovel Gulch. It is accurately located (see Rutledge, 1950, fig. 6) and included in locality 1 of Cobb (1972 [MF 384]; 1976 [OF 76-606]).
Geology: The Broken Shovel prospect is 0.5 mile northeast of the Cinnabar Creek lode mercury mine (TA001). It consists of a zone of discontinuous quartz-stibnite veins along the faulted contact of a vertical mafic dike in Triassic sedimentary rocks (Sainsbury and MacKevett, 1965). The dike, exposed in a few shallow dozer trenches, is 1- to 3-feet-thick and trends N 5-20 E for a distance of at least 320 feet (Sainsbury and MacKevett, p. 40). The quartz veins are narrow, discontinuous, and only locally contain small stibnite lenses and minor cinnabar. Cinnabar was reportedly panned in the gulch drainage downslope from the Broken Shovel prospect. Cady and others (1955) report that sills of silica-carbonate rock (inferred to be altered mafic intrusive rocks) are also present in the gulch.
Workings: A few shallow dozer trenches have explored the prospect.
Age: Late Cretaceous or Tertiary (?). May be similar in age to other mercury deposits in southwest Alaska. Several of these postdate deposition and deformation of mid-Cretaceous clastic sedimentary rocks and emplacement of Upper Cretaceous or Tertiary intrusive rocks.
Alteration: Quartz veining and silica-carbonate alteration of mafic rocks.
Commodities (Major) - Hg, Sb
Development Status: None
Deposit Model: Simple Sb deposits (Cox and Singer, 1986; model 27d)
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Stibnite | Sb2S3 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS - Alaska: | TA018 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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