Mance: Quarry Industry of Southern Indiana 



183 



RAW MATERIALS 



Coal : SO. 225 



Gypsum 0.0125 



.2375 



ACCESSORY EXPENSES 



Repairs. 0.04 



Oil 0.02 



Miscellaneous 0 . 03 



0.09 



Packing and loading 0 . 04 



Works and management 0 . 02 



0.06 



Interest on investment ($700,000) 0 . 07 



Sinking fund and deterioration 0.10 



Management and selling expenses 0 . 065 



0.235 



Total per barrel of output SO. 7725 



The total cost of production in Michigan is figured as follows 

 from data given in D. J. Hale's report on Portland cement, in 

 Vol. VIII of the Geological Survey of that State (pp. 158-190): 



Total cost of materials and labor of manufacture SO . 4785 



Overhead and selling cost 00.2015 



Total SO. 68 



The figures given above are on a plant with an output of 

 1,200 barrels per day. The cost of production would fall below 

 this figure in a larger plant since several of the items quoted 

 above will not increase in the same ratio as the output. 



No reliable figures as to the cost of production in Indiana 

 are at hand but since these two States from which I have quoted 

 prices are bordering States and operate under the same condi- 

 tions, the figures will lie somewhere near those given. 



The industry has reached a point where cost of production 

 and selling price are so close together that cement can only be 

 manufactured economically in large plants. In fact, with the 

 selling price where it is there are very small profits with a plant 

 with an output below 3,000 barrels. 



Since it requires over 400 pounds of limestone to the barrel 

 of cement, on account of the losses from ignition, a 3,000-barrel 

 plant would require at least 600 tons of waste limestone a day. 

 This would be equivalent to approximately 7,000 cubic feet of 



