NE Washington Sedex

Region West, Northwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Permissive tract WR07 for sedimentary exhalative Zn-Pb deposits from the ICBEMP assessment (Box and others, 1996). The focus area outlines Paleozoic black shale units in northeastern Washington deposited in a rifted continental margin slope-and-rise setting, including all sedimentary units with significant black shales (exclusive of the Belt Supergroup and equivalents).
Identified resources None.
Production None.
Status Unknown.
Estimated resources Unknown.
Geologic maps Stoffel and others (1991), scale 1:250,000.
Geophysical data Inadequate aeromagnetic data; partly covered by rank 2 aeroradiometric data.
Favorable rocks and structures The Late Proterozoic Windermere Group, the Lower Paleozoic Metaline sequence and the Paleozoic Covada Group (Stoffel and others, 1991). Prospects are in the Covada Group, an Upper Paleozoic continental slope-and-rise sequence and in Lower Paleozoic shales of the Metaline continental shelf slope sequence.
Deposits None.
Evidence from mineral occurrences Box and others (1996).
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments Three small prospects occur in Paleozoic deep-water strata in northeastern Washington, although they are too small to be considered significant deposits. Numerous barite occurrences and Pb and Zn prospects in the area could also be examples of this deposit type, although other Pb- and Zn-bearing deposit types are also present in the area. (Box and others, 1996).
Cover thickness and description Unknown.
Authors Jane M. Hammarstrom.
New data needs Geophysics, geologic mapping with emphasis on structural control of ore fluids.
Geologic mapping and modeling needs For Washington <25% mapped at a scale of 1:24:000; remaining mapped at intermediate scales. Need higher resolution mapping for much of the focus area.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and aeroradiometric data. For Washington less than 50% coverage at QL3 or better and remaining at QL4 or worse aeromagnetic.
Digital elevation data needs Lidar complete for all but southwestern part of the focus area.