not always confined to tearing the layers apart. The vein- 

 stone consists of purple fluor-spar and silvery white mica 

 with quartz. In this gangue, the cassiterit.e, nearly black in 

 color, is disseminated in small crystalline masses, sometimes 

 one half an inch in diameter and is associated with a little 

 mispickel." 



At the time the Maine Tin Mining Company was operat- 

 ing the Winslow tin deposit, Dr. Forrest Shepard, of Norwich, 

 Connecticut, a geologist of high standing in both Europe and 

 America, and familiar with the Cornish deposits, conducted 

 an extended examination of the property and made a remark- 

 ably enthusiastic report upon it, from which I extract a few 

 sentences, showing his concurrence with the conclusion of 

 Dr. Charles T. Jackson (who visited the locality as early as 

 1869) and with the above-quoted views of Dr. T. Sterry Hunt: 



Dr. Shepherd stated: "A notable fact, not only of in- 

 dividual, but also of national importance, is the opening of 

 five or six metallic veins of rich tin ore in the township of 

 Winslow, Kennebec County. State of Maine * * * * After un- 

 covering the first vein some time since, * * * I was called to 

 make a geological report of the same. I accordingly visited 

 the locality and was deeply interested to find a true, definite 

 vein, of one foot or more in thickness, composed of quartz, 

 rose colored mica, or lepidolite, purple fluor-spar, carbonate 

 of iron, tourmaline, with occasional crystals of calc spar, 

 together with arsenical pyrites. In the midst of these, the 

 rich dark tin ore was found imbedded and surely I could not 

 have wished for more favorable indications. The rock for- 

 mation enclosing this vein was found composed of grauwacke 

 and to some extent calcareous slates, or what is called Killas 

 in Cornwall, * * * in addition to the above favorable indica- 

 tions, a strong elvan wall, or dyke, of apparently gray trap, 

 accompanies the above vein and its companion veins, giving 

 great promise of strength, depth and continuance, as have 

 been found by similar elvan guides or leaders in the rich 

 mining districts of Cornwall * * * Here in Winslow we have 

 tin ore at the surface, in quality equal to the best in Corn- 

 wall and in a series of veins most favorably situated; while 

 in Cornwall, in some mines it is found necessary or as a 

 matter of economy, to have a blacksmith's shop one thous- 

 and feet under ground, so as to sharpen the tools used five 

 hundred feet below * * * Shall the United States longer de- 

 pend on foreign nations for their tin? Shall they reap foreign 

 fields when they have an abundant harvest at arm's length? 

 In what part of the world will they find a supply of this 

 valuable metal at greater advantage than on the banks of 



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