OFR 5-89 - Alaska Resources Library & Information Services (ARLIS)

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CONTENTS Page Abstract ........................................................... 1 Introduction ....................................................... 1 Acknowledgments .................................................... 2 Location, access, and physiography ................................. 2 Previous work ...................................................... 2 Bureau of Mines investigations ..................................... 2 Geology of the Ohio Creek pluton ................................... 4 Tin occurrences .................................................... 7 General description .............................................. 7 Sampling methods and results ..................................... 11 Bulk sample characterization ....................................... 11 Concentration testing ............................................ 12 Mineralogic characterization ..................................... 19 Tin resources ...................................................... 21 Discussion ......................................................... 21 Conclusions ........................................................ 21 References ......................................................... 23 ILLUSTRATIONS 1. Location of study area ......................................... 3 2. Geologic and sample location map of the Ohio Creek pluton ...... 5 3. Geologic sketch map of the hornfelsed argillite inclusion, northwestern Ohio Creek pluton ................................ 8 4. Geologic sketch map of greisen occurrences near the roof of the Ohio Creek pluton ............. ... "I ... 9 5. Geologic sketch map of the greisen occurrences near the southeastern wallrock contact of the Ohio Creek pluton ........ 10 6. Procedures used to concentrate the bulk samples ................ 13 7. Sketches from thin sections showing modes of cassiterite occurrence .................................................... 20 TABLES 1. Major oxide analyses of samples of the Ohio Creek pluton ....... 6 2. Size distribution of the rougher table feed .................... 14 3. Reagent additions and conditions for bulk sulfide flotation .... 15 4. Metallurgical balance for sample 45 ............................ 16 5. Metallurgical balance for sample 57 ............................ 17 6. Metallurgical balance for sample 48 ............................ 18 APPENDIX Appendix A -- Results of sample analyses ........................... 24 Appendix B -- Sample map number vs. field number cross-reference... 29 i U.S. BUREAU OF MINES LIBRARY P.O. BOX 020550 Juneau, AK 99802-0550
cm ft lb mm m.y. oz/st pct pH UNITS OF ABBREVIATIONS USED IN THIS REPORT ppm wt pct centimeter feet pound(s) millimeter million year(s) troy ounces per short ton percent negative loglO of the hydrogen ion content parts per million weight percent
Page 1: TIN OCCURRENCES ASSOCIATED WITH THE
Page 5 and 6: This report describes a portion of
Page 7 and 8: course of field studies, 3 bulk sam
Page 9 and 10: TABLE 1. - Major oxide analyses 11
Page 11 and 12: Tgrn~~~~~~~~~~Tr Tgm ~ ~ Tg fig / \
Page 13 and 14: 1E Muscovite granite .*.-62 LEGEND
Page 15 and 16: Concentration Testing After separat
Page 17 and 18: TABLE 2. - Size distribution of the
Page 19 and 20: TABLE 4. - Metallurgical balance fo
Page 21 and 22: TABLE 6. - Metallurgical balance fo
Page 23 and 24: C. 0 .1 .2 .4 .5 mmm .3 (a) (C) Q Q
Page 25 and 26: only 33 ppm Sn. Samples of the quar
Page 27 and 28: APPENDIX A - Results of sample anal

OFR 5-89 - Alaska Resources Library & Information Services (ARLIS)

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