STATE OF WASHINGTON DEPARTMENT OF NATURAL RESOURCES BRIAN J. BOYLE, Commissioner of Public Lands ART STEARNS, Supervisor DIVISION OF GEOLOGY AND EARTH RESOURCES RAYMOND LASMANIS, State Geologist REPORT OF INVESTIGATIONS 28 TIN. TUNGSTEN. AND MOLYBDENUM GEOCHEMISTRY OF PARTS OF STEVENS AND SPOKANE COUNTIES, WASHINGTON by Bonnie B. Bunning 1986 STATE OF WASHINGTON DEPARTMENT OF NATURAL RESOURCES BRIAN J. BOYLE, Commissioner of Public Lands ART STEARNS, Supervisor DIVISION OF GEOLOGY AND EARTH RESOURCES RAYMOND LASMANIS, State Geologist REPORT OF INVESTIGATIONS 28 TIN, TUNGSTEN, AND MOLYBDENUM GEOCHEMISTRY OF PARTS OF STEVENS AND SPOKANE COUNTIES, WASHINGTON by Bonnie B. Bunning 1985 Printed in the United States of America For sale by Department of Natural Resources, Olympia, Washington Price $ 1.39 . 11 tax 1 .50 COVER PHOTO The Germania mill in Stevens County, Washington. During the 1930's and 1940's, the Germania mine and mill supplied tungsten concentrate to General Electric Company, for use in manufacturing light bulbs. Today the tungsten vein system at Germania is worked out, but the old mine still holds high potential as an exploration target for porphyry molybdenum minerali­ zation. II TABLE OF CONTENTS Page Abstract . 1 Introduction. 1 Location and geographic setting . 1 General geology . 1 Objectives and scope of study . 2 Study methods . 2 Acknowledgments . 3 Geologic models . 3 Tin deposits . 3 Molybdenum deposits . 4 Tungsten deposits . 5 Past production in the study area . 6 Tin (Silver Hill mine) . 6 Production . 6 Geology and mineralization . 6 Tungsten (Germania and Germania Consolidated mines) . 7 History and production . 7 Geology . 8 Mineralization . 8 Alteration . 8 Molybdenum [Deer Trail Monitor (Monitor) mine) . 8 Production . 8 Geology . 8 Mineralization . 8 Favorable prospects . 9 Tin... ... .... ..... .. ...... ...... ................ .... .... .. 9 Spokane County . 9 Freeman clay pit . 9 Stevens County . 10 Huckleberry Mountain area . 10 Read prospect . 10 Deer Trail Monitor (Monitor) mine . 11 Cleveland mine . 12 Togo mine . 12 Daisy and Tempest mines . 13 Young America mine . 13 McMillan prospect . 14 U.S. Forest Service sample G-6/25 llR . 15 U.S. Forest Service sample G-6/27 20R . .. 15 U.S. Forest Service sample K-7 /12 lOR . 16 Tungsten . 16 Stevens County . 16 Regal Serpentine quarries . 16 Molybdenum . 17 Stevens County . 1 7 Germania and Germania Consolidated mines . 17 Blue Grouse Mountain area . 17 Geology . 18 III TABLE OF CONTENTS - Continued Page Alteration . 18 Geochemistry . 18 Silver Summit (Summit) mine . 19 Summary . 20 Recommendations . 20 Tin . 20 Tungsten . 21 Molybdenum . 21 References cited . 23 Appendix A - Sample descriptions and analytical results . 27 Appendix B - Sample location and geochemical maps . 45 IV ILLUSTRATIONS Page Figure 1. Location map of the study area, Stevens and Spokane Counties, Washington .... 2 2. Relationship of tin, tungsten, molybdenum, and copper deposits in granitic rocks .... 4 3. Location map of past producers of tin, tungsten, and molybdenum .............. 6 4. Sample location map - Freeman clay pit ................................ 9 5. Sample location map - Read prospect ......................... .. .......... 10 6. Sample location map - Deer Trail Monitor (Monitor) mine ........... ......... 11 7. Sample location map - Cleveland mine .................................... 12 8. Sample location map - Togo mine .............................. ......... 12 9. Sample location map - Daisy and Tempest mines ............... ...... ... ..