188 BULLETIN 12, UNITED STATES NATIONAL MUSEUM. 



A small amount of cassiterite from two localities, together with a 

 bar of the tin produced, from Montana, was exhibited at the Cen- 

 tennial. An ore of a different character, being a stanniferous wol- 

 fram, has been known in California for many years, and at one time, 

 quite extensive operations were commenced upon the deposit. The 

 ore, however, is somewhat difficult of treatment, and this, with liti- 

 gation, soon closed up the mine and the works. Isolated specimens of 

 cassiterite have been found at various times from several localities in 

 Maine, and the next discovery of any importance was at Winslow, in 

 that State, where a more definite vein carrying cassiterite was discov- 

 ered in 1867. The vein here, however, was exceedingly small and noth- 

 ing has been accomplished. Following close upon each other, in 

 1882-83, there were discoveries of tin in three widely separated locali- 

 ties, which have given promise of ultimately producing more or less tin. 

 These localities are at the Broad Arrow Mines, in Alabama; the Cash 

 Mines, in Rockbridge County, Virginia, and the deposits at Harney 

 Peak, in the Black Hills of Dakota. In 1884 a further discovery was 

 made at King's Mountain, North Carolina. 



The collection of tin ores, besides including a few specimens of purely 

 mineralogical significance, contains samples of every locality that has 

 ever given any promise of producing the ore in any amount. 



(1) Cassiterite, fluofite, margarite, calcite, sLows full width of the vein. Wins- 

 low, Kennebec County, Maine. (4785.) 



(2) Cassiterite, in mica and quartz. Peru, Oxford County, Maine. (54215.) 



(3) Cassiterite, in feldspar, with quartz and tourmaline. Norway, Oxford County, 

 Maine. (54216.) 



(4) Cassiterite, in feldspar, with quartz and tourmaline. Rumford, Oxford County, 

 Maine. (54214.) 



(5) Cassiterite, crystalline. Paris, Oxford County, Maine. (54213.) 



(6) Cassiterite, in schist, discovered in 1840. Jackson, Carroll County, New Hamp- 

 shire. (13397.) 



(7) Metallic tin, smelted in 1840 from the Jackson ores. (33617.) 



(8) Cassiterite, in coarse granite, called "jjreissen." Black Hills, Dakota. (56546.) 



(9) Cassiterite, in coarse granite, called "greisseu." Etta Mine, Rapid City, Pen- 

 nington County, Dakota. (65148.) 



(10) Cassiterite, in quartz. Width of vein .35 feet. Etta Mine, Pennington County, 

 Dakota. (.56547.) 



(11) Cassiterite, in rough crystals and water-worn fragments, with other heavy 

 minerals. Black Hills, Dakota. (56548.) 



(12) Metallic tin, some of the first metal smelted from the Black Hills ores. (51213.) 



(13) Cassiterite, in rough crystals and water-worn fragments, with other hettvy 

 minerals. Bear Gulch district, Lawrence County, Dakota. (333.56.) 



(14) Cassiterite, in water-worn pebbles, stream tin. Ten Mile district, Lewis and 

 Clarke County, Montana. ^10922.) 



(15) Cassiterite, in water- worn pebbles, stream tin. Prickly Pear, Jefferson County, 

 Montana. (11044.) 



(16) Metallic tin, from the Prickly Pear ores, Montana. (29909.) 



(17) Cassiterite, characteristic sample of the Temescal ore. Temescal, San Ber- 

 nardino County, California. (.56423. ) 



(18) Stanniferous wolfram. San Jacinto Mine, Temescal, San Bernardino County, 

 California. (16097.) 



