Transactions . ividual pieces of the oreare very hard hematite. There is a peculiar layer of alteredschist, about thirty feet thick, between the ore and theunaltered green schist. This layer is locally termed paint-rock. Fig. 6 shows the extent of the ore-body at the eighth level,and Fig. 7 is a vertical section. It will be seen that the orelies in a fold or basin, dipping slightly to the north, and iscovered by a jasper capping. The basin pitches to the east ata small angle. At Soudan, the pitch is to the west. * This arrangement, being substantially tlie same as that described in the paperof
Transactions . ividual pieces of the oreare very hard hematite. There is a peculiar layer of alteredschist, about thirty feet thick, between the ore and theunaltered green schist. This layer is locally termed paint-rock. Fig. 6 shows the extent of the ore-body at the eighth level,and Fig. 7 is a vertical section. It will be seen that the orelies in a fold or basin, dipping slightly to the north, and iscovered by a jasper capping. The basin pitches to the east ata small angle. At Soudan, the pitch is to the west. * This arrangement, being substantially tlie same as that described in the paperof Mr. Axel Sahlin, on The Handling of Material at the ISlast-Furnace, neednot be further described. See pages 14 and 29 of the present volume. METHODS OF IRON MINING IN NORTHERN MINNESOTA. 353 Fig. 6 shows the positions of the shafts that are now No. 1 is located at the western extremity of the deposit,where the ore was first discovered and opened up, but the .. Shaft A- --# 8th. Level Shalt. c-^Ti 8th. Level Scale0 40 80 130 1G0 200 6 Shaft Yiq. 6.—Outline of the Chandler Ore-body at the Eighth Level. shaft has been worked out. The bulk of the ore now comesfrom below the sixth level. As is indicated in Fig. 7, therehas been considerable trouble in the past from the wrecking ofthe tops of the shafts, due to the cave extending further than 354 METHODS OF IRON MINING IN NORTHERN MINNESOTA.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
