Transactions . FiG. 5.—Section along dip, Bl.\ck Hollow mine. and the clays taken only from the face of the entries as they clay is mined by blasting with 40 per cent, dynamite. The outputof the mine is about 300 tons per day; during the last 6 years about 250,000tons of clay has been mined at an approximate value of $500,000. J. A. EDE 255 The clay is fed into an Sj^i-it. Clearfield dry pan grinder, the weight ofwhich is 53,000 lb. Two crusher rolls, weighing 8500 lb. each, are revolvedby a pinion and crown overhead drive in a pan having slotted plates forthe bottom; thes
Transactions . FiG. 5.—Section along dip, Bl.\ck Hollow mine. and the clays taken only from the face of the entries as they clay is mined by blasting with 40 per cent, dynamite. The outputof the mine is about 300 tons per day; during the last 6 years about 250,000tons of clay has been mined at an approximate value of $500,000. J. A. EDE 255 The clay is fed into an Sj^i-it. Clearfield dry pan grinder, the weight ofwhich is 53,000 lb. Two crusher rolls, weighing 8500 lb. each, are revolvedby a pinion and crown overhead drive in a pan having slotted plates forthe bottom; these slots are ^s in. wide. The material coming in is guideddirectly under the rolls and as it becomes sufficiently ground it escapesthrough the slots. The ground material is kept from accumulating bymeans of the scrapers attached to the pan bottom which, as they revolve. U U U U U U l_ DDDDDCDDDDDDL Fig. 6.—Mine No. 2, Illinois Zinc Co. with the bottom, sweep the dust round to an opening in the flooringthrough which it drops to a bucket elevator, which carries it to Newaygoscreens that reduce the rough powder to 20 mesh. The finished productis carried over the river to the C. B. & Q. R. R. by a two-bucket, Leschen& Co. aerial tram; each bucket holds 1600 lb. The tram line requires only10 hp. and handles 40 tons per hour. The power installation consistsof a Kewanee boiler of 150 hp. and a 150-hp. CorHss Filer Stowcll the No. 7 coal and above the La Salle quarry limestone, now 256 MINERAL RESOURCES OF THE LA SALLE DISTRICT better known as the Portland cement rocks, some very useful clay andcommercial shale has been mined and manufactured t»y the La SallePressed Brick Co. The clay under the No. 7 scam of coal was workedroom and pillar, at the Illinois Zinc Mine No. 2. The rooms were16 ft. ( m.) wide leaving a 16-ft. pillar
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
