Transactions . are now disseminated. Whateverchanges have affected these rocks haveaffected the ores which are a part of the beds are bent, the ore-bodiesare bent; wThere the rock-beds are faulted,the ore-bodies are similarly faulted ; andwhere streams have cut down, through therocks, valleys of various depths andwidths, these valleys have been cutthrough the ore-beds likewise. The miners and prospectorsof North Arkansas often have a fear of blasting into the faceof one of these bedded zinc-deposits, lest it go blind, orpinch out, a little further in. The bedded ores of NorthArkansa
Transactions . are now disseminated. Whateverchanges have affected these rocks haveaffected the ores which are a part of the beds are bent, the ore-bodiesare bent; wThere the rock-beds are faulted,the ore-bodies are similarly faulted ; andwhere streams have cut down, through therocks, valleys of various depths andwidths, these valleys have been cutthrough the ore-beds likewise. The miners and prospectorsof North Arkansas often have a fear of blasting into the faceof one of these bedded zinc-deposits, lest it go blind, orpinch out, a little further in. The bedded ores of NorthArkansas do vary more or less in the thickness of the ore-bearing portion of the bed and in the percentage of sphaleritein a given amount of gangue. But the bedded deposits areremarkably even in thickness and richness; and if they changefor the worse in a short distance, they may be depended uponto recover their richness within an equally short distance. Nosudden changes in the thickness or richness of the bedded ore-. Part of the West Wallof the Canady Mine,Showing Sphalerite inJoints and Bedding-Planes. Tin: i i \« \M» LI LD-D1 P081 i - i KOH I n LRU LNfl LB. bodies should excite alarm ; it is only the gradual thinning outor impoverishment of the beds that should cause aneasinoth rocks and or<These alterations have been produced by the action of waters,aided by whatever acids and alkalies they may have found athand from time to time. The surface-waters penetrating theBoils and rocks have obeyed the laws of hydrostatics, and havefollowed whatever channels these laws and the nature of the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
