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- W2277347773 abstract "Cumulative coal production in the Michigan basin is about 50 million tons, mostly from thin seams in underground mines. Remaining reserves are in fields of 100-1500 ac, mostly less than 250 ac, and in beds less than 3 ft thick. Very small areas are available for surface mining because of thick cover of unconsolidated glacial drift (150-400 ft). The principal mitigating factors and mining problems that would be encountered in further subsurface development include thin and locally irregular coals; small areas available for each mine; considerable undulation of seams locally in short distances; podlike geometry of most local seams; coal thinning and splitting on the margins of the fields; weak character of roof shales; numerous erosional cutouts; large quantities of water in overlying unconsolidated strata; and disturbance of aquifers. Exploration should be aimed at establishing paleogeographic patterns of the various Pennsylvanian sediments associated with the coals, particularly in these interdigitated marginal marine-coastal plain-delta environments. A three-stage exploration program is proposed to reevaluate stratigraphy from cuttings and logs of all wells penetrating coal-bearing areas; to drill one core test with geophysical logs in each of about 30 townships where geologic inference or a record of coal exists; and to perform 2-5more » additional core tests and logs in each of 10-12 local areas to establish the geometry, quantity, quality, and minability of coals and the roof rock character.« less" @default.
- W2277347773 created "2016-06-24" @default.
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- W2277347773 date "1986-08-01" @default.
- W2277347773 modified "2023-09-23" @default.
- W2277347773 title "Geologic exploration program for Michigan basin Pennsylvanian coal" @default.
- W2277347773 hasPublicationYear "1986" @default.
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