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GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



TABLE X. Various ores and vein materials. 



X". B. With the exceptions noted, blanks in tbe table denote "no tests." 



1. "Hard carbonate," Scuoper mine, Yankee Hill. 



2. "Silicions ore," 1 Capitan mine, Taylor Hill. 



3. "Gold ore," Ore Coll. No. 60, El Capitan mine, Taylor Hill. 



4. Silicions hematite, Ore Coll. Ko. 84, Chrysolite mine. 



5. "Iron ore," Ore Coll. Ko. 90, Kenosha mine, Long and Derry Hill. 

 G. Altered limestone (tight material), Garden City mine. 



7. Altered limestone (dark material), Garden City mine. 



8, 9, and 10. Specimen showing pyiile altering to a light ocherouB mass. Ore Colt No. 44, No Name gulch, Lake Co. 

 8. Nucleus of pyrite. 9. Dark zone. 10. Light outer zone. 



11. WLite tilling in chert nodule from porphyry, Ore Coll. No. 300b, Ben Burb shaft. 



12. Chert nodnle, Ore Coll. No. 299, 1 Paso shaft. 



13. Breccia with oie cement, Ore Coll. No. 53, Evening Star mine. 



14. Chert under ore body, Little Pittsburgh mine. 



15. Granular quartz under ore, Ore Coll. No. Sa, Waterloo mine. 



a Remainder FeiOi and AliOi, no water. 



b Remainder FeOj and AlsOs. Of the SiOt 3.06 per cent, was soluble in n moderately strong solution of pntaasium 

 hydrate. 



c Cementing material chiefly pyromorphite, with some galena and cemssitc, also a little calcite. 



d Remainder chiefly PbCOi and FeiOj; of the silica 3.93 per cent, was soluble in a moderately strong solution of 

 potassium hydrate. 



e By difference. 



/Calculated. 



g By difference; includes some PbO and Sb*O 6 



h By difference; includes a little SV< i ,. 



i Remainder chiefly SiOi. 



.i Remainder U S( ) . and HjO. 



REMARKS ON TABLE X. 



The analyses of the above table were made without view to completeness, the 

 object being iu the majority of cases to ascertain merely the general nature of the ore 

 or material under hand. As this appears at a glauce from the tabulated results, fur- 

 ther remarks are unnecessary except iu the case of 8, 9, and 10. The specimen showed 

 a nucleus of granular pyrite iu process of decomposition, ferric oxide being observable 

 throughout the mass. This very irregular nucleus was iuclosed in an envelope of dark- 



