Dutch John Lease

The Dutch John Lease is a molybdenum mine located in Okanogan county, Washington at an elevation of 3,251 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Dutch John Lease
Secondary: Sherwood
Secondary: Lodge
Secondary: Texas Creek
Secondary: Seneff

Commodity

Primary: Molybdenum
Secondary: Tungsten
Tertiary: Iron
Tertiary: Copper

Location

State: Washington
County: Okanogan
District: Squaw Creek District

Land Status

Land ownership: State
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: Lodge, W. L.
Home Office: Soap Lake, Wa

Owner Name: Sherwood, S. J.
Home Office: Twisp, Wa

Owner Name: Seneff, H. E.
Home Office: Kirkland, Wa.

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Contact Metasomatic
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Northern Cascade Mountains

Mineral Deposit Model

Model Name: Skarn Cu

Orebody

Form: BED

Structure

Type: L
Description: Northeast Plunging Anticline, Small Drag Folds

Alterations

Alteration Type: L
Alteration Text: Limestone Beds Altered To Garnet.

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Analytical Data: <0.25% SCHEELITE

Materials

Ore: Hematite
Ore: Molybdenite
Ore: Powellite
Ore: Magnetite
Ore: Chalcopyrite
Ore: Pyrite
Ore: Scheelite
Gangue: Calcite
Gangue: Grossularite
Gangue: Epidote

Comments

Comment (Deposit): NO TUNGSTON ORE PRODUCTION. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Deposit): MRDS RECORDS D001390, D000671 HAVE BEEN MERGED WITH THIS RECORD AND DELETED

Comment (Geology): STRIKE ABOUT N60E AND DIP 30SE. MINOR DISCREPANCIES IN MAJOR STRUCUTURE ARE NOT UNCOMMON, BUT ARE MOST COMMON NEAR MEDASED-DIORITE CONTACT. THINLY LAMINATED BEDS ARE SLIGHTLY CRENULATED AND THERE WAS DEVELOPMENT OF NUMEROUS SMALL DRAG FOLDS ON NORTHWEST LIMB NEAR NOSE OF A MAJOR NORTHEAST PITCHING ANTICLINE. THERE ARE AT LEAST 10 GARNETIFEROUS BEDS EXPOSED FOR 3000 BY 1000 FT; 1-9 FT THICK AND AVG ABOUT 3 FT. SOUTH OF CABIN A 4 FT THICK GARNET BED COVERS ABOUT 800 SQ YDS, ON SURFACE. A 2-4 FT GARNET BED IS EXPOSED FOR 100 FT, 300 FT S20E OF CABIN. A 3-9 FT GARNET BED 340 FT S20E OF CABIN IS EXPOSED FOR 850 FT. SEVERAL SMALLER GARNET BEDS ARE EXPOSED IN GENERAL AREA. ABOUT 2000 FT EAST OF CABIN ARE SEVERAL SMALL EXPOSURES OF 1-5 FT GARNET BEDS. ABOUT 3000 FT N60E OF ABIN ARE SEVERAL 2-3 FT GARNET BEDS EXPOSED OVER 280 SQ YDS. GARNET BEDS PROBABLY RESULTED FROM ALTERATION AND REPLACEMENT OF LIME BEDS BY SOLUTIONS AND GASES GIVEN OFF DURING INTRUSION OF DIORITE. MOLYBDENITE

Comment (Commodity): AVERAGES 80% GARNET LOCALLY

Comment (Location): ON A SOUTHWEST-TRENDING RIDGE ABOUT 1 MI SOUTH OF TEXAS CREEK

Comment (Development): THREE 80-ACRE PROPERTIES.

Comment (Deposit): ORE SCATTED THROUGHOUT GARNET BEDS.

Comment (Workings): 12 FT SHAFT ON TOP OF RIDGE 420 FT S20E FROM CABIN; ADIT AT NORTHEAST CORNER OF CABIN DRIVEN SOUTHEAST FOR 85 FT; ANOTHER ADIT 50 FT NORTHEAST OF 1ST ADIT DRIVEN SE FOR 35 FT (CAVED IN 1945); OPEN CUTS.

Comment (Geology): AND CHALCOPYRITE DO NOT CONSTITUTE ORE EXCEPT FOR SMALL AREAS SEVERAL FT IN DIAMETER THAT WOULD MAKE GOOD MO ORE. MUCH OF MAGNETITE OCCURS AS BLADED CRYSTALS, TO 1 IN. ACROSS, SHOWING WELL-DEVELOPED PARTING. COMMONLY, MAGNETITE CRYSTALS FORM RADIAL PATTERN. SCHEELITE IS SCATTERED THROUGHOUT GARNET ROCKS, AND THERE IS CONSIDERABLE VARIATION IN SCHEELITE CONTENT. SCHEELITE CRYSTALS RANGE FROM MINUTE SPECKS TO 0.25 IN. ACROSS. CONSIDERABLE POWELLITE, FROM OXIDATION OF MOLYBDENITE AND SCHEELITE, HAS FORMED IN GARNET BEDS.

Comment (Geology): TOP OF RIDGE AND UPPER PART OF NORTHWEST SLOPE IS THIN-BEDDED MICA SCHISTS, ARGILLITES, LIMESTONES, AND QUARTZITES. NORTHWEST OF RIDGE IS LARGE INTRUSIVE DIORITE (HORNBLENDE-BIOTITE GRANODIORITE TO QUARTZ MONZONITE AND HORNBLENDE DIORITE. DIORITE-METASEDIMENTARY CONTACT NOT EXPOSED, BUT APPROXIMATE CONTACT CAN BE TRACED FOR ABOUT 1500 FT AT NORTH END OF RIDGE. AT SOUTHERN END OF RIDGE, NEAR CABIN, NEAREST EXPOSURE OF DIORITE IS SEVERAL HUNDRED FT TO WEST. NARROW APLITE AND PEGMATITE DIKES, PROBABLY RELATED TO DIORITE, WERE INJECTED INTO AND BETWEEN METASEDIMENTARY BEDS TO PRODUCE A LIT-PAR-LIT EFFECT LOCALLY. GENERALLY, METASEDIMENTARY BEDS APPEAR TO LIE NEAR NOSE ON NORTHWEST LIMB OF AN ANTICLINE PITCHING NORTHEAST. FOR ABOUT 300 FT SOUTH OF CABIN BEDS STRIKE ABOUT N85E AND DIP 15-35NW, WITH DIPS PROGRESSIVELY INCREASING FROM SE TO NW. ON TOP OF RIDGE SOUTH OF CABIN BEDS STRIKE ABOUT N50W AND DIP 15-2ONE WHICH CONTINUES ALONG RIDGE TOP TO ITS NE END. ABOUT 3000 FT N60E OF CABIN BEDS

References

Reference (Deposit): HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 345.

Reference (Deposit): KING, R.U., U.S. GEOLOGICAL SURVEY, UNPUB DATA.

Reference (Analytical Data): SRC.REF: N

Reference (Deposit): LEMMON, D.M., U.S. GEOLOGICAL SURVEY, UNPUB DATA.

Reference (Deposit): LEMMON, D.M., AND TWETO, O.L., 1962, TUNGSTEN IN THE UNITED STATES: U.S. GEOLOGICAL SURVEY MINERAL INVESTIGATIONS RESOURCES MAP MR-25.

Reference (Deposit): CULVER, H.E., AND BROUGHTON, W.A., 1945, TUNGSTEN RESOURCES OF WASHINGTON: WASHINGTON DIVISION OF GEOLOGY BULLETIN 34, P. 51-52.

Reference (Deposit): BUNNING, B.B., 1990, GEOLOGIC MAP OF THE EAST HALF OF THE TWISP 1:100,000 QUADRANGLE, WASHINGTON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 90-9, SCALE 1:100,000.

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