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CONTENTS <br />Page <br />Abstract---------------------------------------------------- - - - - -- <br />C1 <br />Introduction---------------------------------- -------------------- <br />1 <br />Location of deposits------------------------------------- - - - - -- <br />2 <br />Fieldwork and research----------------------------------- - - - - -- <br />4 <br />Acknowledgments--------------------------------------- - - - - -- <br />4 <br />Production--------------------------------------------- - - - - -- <br />.4 <br />Development--------------------------------------- - - - - -- <br />5 <br />Statistics------------------------------------------- - - - - -- <br />7 <br />Mineralogy------------------------------------------------- - - - - -- <br />9 <br />Primary zinc minerals------------------------------------ - - - - -- <br />9 <br />Secondary zinc minerals---------------------------------- - - - - -- <br />10 <br />Smithsonite----------------------------------------- - - - - -- <br />11 <br />Hemimorphite ( calamine) ----------------------------- - - - - -- <br />12 <br />' Willemite------------------------------------------- - - - - -- <br />12 <br />Chalcophanite, hetaerolite, and hydrohetaerolite -- - - - - - - - - - - - - - <br />13 <br />Hydrozincite--------------------------------------- - - - - -- <br />15 <br />Aurichalcite----------------------------------------- - - - - -- <br />15 <br />Sauconite------------------------------------------------- <br />15 <br />Other secondary zinc minerals------------------------- - - - - -- <br />16 <br />Associated secondary minerals----------------------------- - - - - -- <br />16 <br />Mode of occurrence of oxidized zinc deposits-------------------- - - - - -- <br />19 <br />Distribution in respect to kinds of country rock - - - - - - - - - - - - - - - - - - - <br />20 <br />Types of deposits and their relations to other ores ----------------- <br />20 <br />Deposits probably formed by hypogene solutions -------------- <br />21 <br />Deposits formed by supergene solutions- - - - - - - - - - - - -- - - - - - - - - <br />23 <br />Direct replacement- of primary sulfides - - - - - - - - - - - - - - - - - - - <br />23 <br />Oxidized veins and- breecias------------------- - - - - -- <br />24 <br />Oxidized massive bodies---------------------- - - - - -- <br />26 <br />Oxidized disseminated deposits - - - - - - - - - - - - - - - - - - - -- - <br />32 <br />Replacement of wallrock after migration of zinc ----------- <br />33 <br />Blanket and pocket ore bodies---------------- - - - - -- <br />36 <br />Replacement shells around pipes or mantos ----------- <br />37 <br />Replacement bodies in vein walls and secondary veins <br />along fissures------------------------------ - - - - -- <br />38 <br />Origin of oxidized zinc deposits-------------------------------- - - - - -- <br />38 <br />Hypogene deposits--------------------------------------- - - - - -- <br />38 <br />Supergene deposits--------------------------------------- - - - - -- <br />39 <br />Resources-------------------------------------------------- - - - - -- <br />44 <br />Known reserves----------------------------------------- - - - - -- <br />45 <br />46 <br />Outlook for future development of reserves - - - - - - - - - - - - - - - - - - - - - - - <br />Geologic features favorable for prospecting------------------ - - - - -- <br />47 <br />Problems of identification of ores------------------------ - - - - -- <br />48 <br />Outlook for future development of markets - - - - - - - - - - - - - - - - - - - - - - - <br />49 <br />in <br />