. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. Both ore exploited and ore now in mine are represented as ore, since the purposeof thii? plate is to show the manner of the development of the ore rather than the pres-ent stage of exploitation.) Fid. 1. Horizontal section of the Aragon mine at the eighth level, showing the rela-tions of the ore to the talc-schist horizon of the dolomite, to the ore-bearing forma-tion, and to the Brier slate. There is here a double fold, the main ore de
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. Both ore exploited and ore now in mine are represented as ore, since the purposeof thii? plate is to show the manner of the development of the ore rather than the pres-ent stage of exploitation.) Fid. 1. Horizontal section of the Aragon mine at the eighth level, showing the rela-tions of the ore to the talc-schist horizon of the dolomite, to the ore-bearing forma-tion, and to the Brier slate. There is here a double fold, the main ore deposit beingat the l)ottom and along the limbs of the north syncline. Scale: 1 inch equals 250 feet. Fig. 1, Menominee Special Folio, No. 62, 1900. Fig. 2. Vertical east-west longitudinal section of the Aragon mine, north fold,showing even more clearlj- than fig. 1 the relations of the ore to the talc-schist andTraders ore-bearing formation. The very steep pitch of the ore deposit is notable,it being represented In- the contact between the talc-schist and the ore-bearing for-mation and ore. Scale: 1 inch equals feet. Fig. 8, Menominee Special VAN HiHE.] MENOMINEE DISTRICT. 395 fold, but especially along the main dolomite wall to the north. (SeePI. LVI, fig. 1.) This occurrence is especially interesting siiu-e theore deposit was found steadily to increase in size as it assumed definiterelations to the underl3ing pitching trough. At the high levels, whereit did not have a definite impervious basement furnished by the dolo-mite formation, it was comparatively small. As soon as it had assumedat lower levels definite relations to that trough it became a large orebod}, and has continued to increase in size to the present depth, nowreached at the eighth level, where the relations of the ore to the pitch-ing trough are perfectly illustrated. (Figs. 1 and 2 of PI. LVI.) The next important groups of mines along the southern belt arethose adjacent to Vulcan, including the Vulc
Size: 1264px × 1977px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
