380 CEMENTS, LIMES, AND PLASTERS. 



2 engineers at $1 . 50 $3 .00 



2 firemen at $1 . 25 2 .50 



400 cars marl at $0 . 08 32 .00 



80 cars clay at $0 . 14 11 .20 



2000 Ibs. coal at $2.40 per ton '. . 2.40 



Total cost marl and clay for 1200 bbls. cement . . $51 . 10 

 Cost marl and clay for 1 bbl. cement . 043 



Plant %. The marl and clay occur in a swamp half a mile from the 

 mill. The surface material is 2 to 3 feet black loam; this is underlain 

 by 9 feet marl, and this, in turn, by the clay. A dredge with a 15- 

 H.P. engine and a crew of two men handles the marl, digging enough 

 for 240 barrels cement in ten hours. A smaller dredge with orange- 

 peel bucket, run by one man, handles the clay. One locomotive hauls 

 the material to the plant over tracks laid alongside the excavations. 

 Total costs per day for a 240-barrel plant are as follows : 



1 marl-dredge runner $1 . 50 



1 leverman, marl dredge 1 . 25 



1 clay-dredge runner. . 1.25 



1 locomotive engineer 1 . 50 



350 Ibs. coal for marl dredge at $2 . 20 per ton . 38$ 



150 Ibs. coal for clay dredge at $2 . 20 per ton . 16 \ 



500 Ibs. coal for locomotive at $2 . 20 per ton ...... . 55 



Cost of clay and marl for 240 barrels cement ... $6 . 50 

 Cost of clay and marl for 1 barrel cement .027 



Plant 8. Marl dredged from lake one quarter mile from mill. This is 

 done by contract, the marl being delivered to the mill for 5 cents per 

 cubic yard. This price is about equivalent to $0.018 per barrel of 

 cement for marl alone. In this case the dredging-plant was bought and 

 installed at the expense of the company, but the contractor pays all 

 the current expenses, including pay, repairs, coal, etc. 



Plant 4- Marl dredged from lake one third mile from mill by a 

 dredge operating a 1 ^-cubic-yard orange-peel bucket. The marl is fed 

 through a stone separator and then pumped to the mill on Harris system. 

 Total cost is about as follows: 



2 men at $1 .50 $3.00 



3 men at $1 . 25 3 . 75 



2J tons coal at $2 .40 6 .00 



Total cost of marl for 500 barrels cement. . . . . $12.75 

 Cost of marl for 1 barrel cement . 025 



