COLLKCTIONS I\ KCONOMIC GKOLOGY AND Mi:TALLrK(;V. 177 



Besides the zinc mineral speeiinens, all of which represent ores, the 

 loUowin^^ fharaeteristic ore sinciinens are shown : 



*>xidized orvH. 



(1) Franklinite, ziiicito. Franklin, Suaacx County, New Jersey. (r>{j:W9.) 



(2) Willetuite, Franklinit*-, zincitc. Sterlin{; Hill, Susaex County, Now Jersey. 



^ :4):h"). ) 



(3) Calaniini', crystallized. Franklin, Sns-sex County, New Jersey. ('16:188.) 



(I) Calamine, crystallized. Friedensville, Lehigh County, Pennsylvania. (10<V«.) 

 (.')) Calamine and smitbsonite, colored l»y iron. Mossy Creek, JefFerson County, 

 Te n n e sse e . ( ;").'>.*< U . ) 

 (<*.) Impure calamine. Hertba Zinc Mine, I'ulaski Couuty. Virginia. (5.0744.) 

 (7) Calamine, crystallized. Missouri. (65261.) 



>'<ulphide orts. 



(1) Blende, crystallized. Cow-iii A Bliss Mine, Lehigh, Jasper County, Missouri. 

 (550C9. ) 



(2) Blende and chert. Baker Diggings, Galena, Cherokee Countv, Kansas. 

 (r.<;229. ) 



(:i) Blende and eheri. Baker Diggings, (ialeua, Cherokee County, Kansas. 

 (65:<2;5. ) 



(4) Blende and chert. Baker Diggings, Galena, Cherokee County, Kansas. 

 (66324.) 



(5) Blende and chert. Oronogo, Jasper County, Mis-souri. (5<]235. ) 



(6) Bleudo, decomposing. Grauby, Newton County, Missouri. (64471).) 



THE PREPARATION OF BLENDE. 

 THE r,ALK::.V MIM. ok the south side mixing and MANUFACTITKING CO.MPA.VY. 



This mill treats the ores of the Pittsburgh, Kansas district, consist- 

 in^'of blende, with galena ami a little pyrite, in a gangue of chert. The 

 ore is tirst crushed in a Hlake crusher, and then in coarse rolls, after 

 which it goes through a 7-millimetre trommel. The coarse ore from this 

 is cru.shed in fine rolls, while the fine goes to a sizing trommel. The 

 carefullv sized ore is treated in a si^ries of live 4-8ieved eccentric jigs, 

 yielding first heads, galena containing a little pyrite; second an<l third 

 hea<ls, blende; fourth heads, chats that are <'iushed, and final tails to 

 waste. The jnocess is illustrated by the sdicme figure 1(». 



The mill will treat L'o tons in about 1(» in. nrs, yielding L'O to !'"> jier 

 cent, of dressed mineral, mostly blende. 



The collection taken by Mr. J. P. (lazzam, k. .m., September, 1884, 

 shows a full series of the products. 



(1) Ore, crushed. (56173.) 



(2) Crushed ore. greater than 7an<l less than 5 m.llinief res. fe«l on lirst sieve hrsf 

 jig. (.'.6174.) 



(3) (ialena. heads, tirst sieve, lirst jig; sold. (5«U7."i. » 



(4) Blende, heads, second ami third sieves, first jig; sold. (.06176.^ 



(.5) Blende and chert, heads, fourth sieve, first jig; recruslml. (.'■>6177.) 



(6) Chert, Ideude, tailings, first jig. (56178.) 



(7) (!rushed ..re, gre.Uer than 5 and lass than .3 millimetres. f...l on first sieve sec 

 ondjig. (,'.(;i7;t. ) 



JH10~No. 41' 11' 



