| Basis for focus area |
Cluster of historical silver-lead-zinc-copper-antimony-gold deposits. |
| Identified resources |
Historical production of copper, gold, lead, silver, and zinc. |
| Production |
Most important producers of Pb-Ag ore in northern Idaho outside of the Coeur d'Alene district; production 1913 through 1943: 201,717 short tons of ore, 37.28 fine oz Au, 1,004,647 fine oz Ag, 20,242 lbs Cu, 24,247,852 lbs Pb, 774,300 lbs Zn (1942-43 only) (Anderson, 1947b). |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Lewis and others (2020), scale 1:24,000; Harrison and Jobin (1965), scale 1:62,500. |
| Geophysical data |
Inadequate Rank 3 to 4 aeromagnetic and Rank 4 aeroradiometric coverage. |
| Favorable rocks and structures |
Wallace and Striped Peak Formations, members of the Precambrian Belt Supergroup; closely associated with faulting and igneous activity that is probably of early Tertiary age (Anderson, 1947b). |
| Deposits |
Lawrence mine (MRDS dep_id: 10105566), Hope mine (MRDS dep_id: 10088842), Whitedelf mine (MRDS dep_id: 10103876), Ralph prospect (MRDS dep_id: 10120083), Little Senator prospect (MRDS dep_id: 10069974). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Galena and sphalerite are ore minerals, with calcite, pyrite, sericite, and siderite. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Comments |
The lead-silver deposits are much like those in the Coeur d'Alene district, but on the whole they have a somewhat higher proportion of silver and antimony because of a late local hypogene enrichment. Fundamentally, however, they are galena siderite fillings and replacements along zones of fractured and fissured rock" (Anderson, 1947b). |
| Cover thickness and description |
Unknown. |
| Authors |
Jane M. Hammarstrom, Virginia S. Gillerman, Reed S. Lewis, Christopher A. Tate. |
| New data needs |
Digitization of geologic maps, geophysics. |
| Geologic mapping and modeling needs |
Needs digital geologic map coverage. |
| Geophysical survey and modeling needs |
High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys, although not useful for this deposit type. |
| Digital elevation data needs |
Lidar in progress. |
