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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Trench 7--Divide Zone (Bonanza Hill)

Prospect in Alaska, United States with commodity Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308001
Record type Site
Current site name Trench 7--Divide Zone (Bonanza Hill)

Geographic coordinates

Geographic coordinates: -165.39737, 64.58258 (WGS84)
Relative position The Trench 7--Divide deposit is at an elevation of 450 to 465 feet about 1,200 to 1,500 feet due east of the rounded top of Bonanza Hill. The map location is in the northwest corner of section 36, T. 10 S., R. 34 W., Kateel River Meridian, and it is accurate.

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Nome C-1(quadrangle 1:63,360 scale)

Solomon NW(quadrangle 1:100,000 scale)

Nome(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Nome(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Sitnasuak Native Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Pyrite Ore
Albite Gangue
Calcite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Nearby scientific data

(1) DOnx
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Trench 7--Divide deposit was identified from exploration by BHP in 1990 and by Newmont Mining Company in 1992; there are some old trenches and cuts of uncertain age on the deposit. The area was mapped by Thomas Borovicka for Newmont in 1992; his map was modified for Kennecott Exploration Company by C.C. Hawley in 1993 and 1994. The Trench 7--Divide deposit appears to be bounded on the northwest by a steep fault that strikes N 50 E. The apparent displacement, evidenced by offset of a calcareous quartz-mica schist layer, is about 10 feet. Southeast of the fault, the deposit is about 200 feet across. Locally, there are sheeted veins of calcite and quartz; older sloughed trenches show accumulations of vein quartz boulders. The deposit is irregular; locally it contains 0.05 to 0.07 ounce of gold per ton. It is possible that the deposit continues to the northeast to Placer Dome trenches 88-3, -4 and -5 (NM223). Bonanza Hill is mainly underlain by nearly horizontal calcareous quartz-muscovite schist and marble probably of early Paleozoic protolith age (Hummel, 1962 [MF 247]; Sainsbury, Hummel, and Hudson, 1972 [OFR 72-326]; Till and Dumoulin, 1994; Bundtzen and others, 1994).
  • Age = Mid-Cretaceous; veins cross cut regionally metamorphosed schist; see NM207.

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Nome

Comments on the workings information

  • Workings / Exploration = This prospect has been explored by numerous trenches and shallow drill holes.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = This report

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUL-00 Hawley, C.C. and Hudson, Travis L. Hawley Resource Group

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.