Part IV.—Cost of Steam Shovel Work.
The cost of steam shovel work varies greatly with the different conditions affecting each piece of work. It depends mainly upon the nature of the material, its location, the capacity and efficiency of the steam shovel, and the supply of empty cars or wagons. The efficiency of a steam shovel is not necessarily proportional to its capacity, but to the amount of work done compared to its cost; and while the amount of work done is generally larger in the machines of larger capacities, this advantage may be more than balanced by the greater cost of operation, including the cost of labor, fuel, supplies and repairs, etc. Machines of the largest capacity, with dipper of 2½ cu. yds. capacity, are employed mostly in excavating soft materials, especially in loading gravel for ballasting. Machines of medium capacity are usually the most efficient for general construction work.
The average daily operating expenses of a steam shovel of medium capacity are about as follows:
| One engineman | $4.00 | |
| One cranesman | 3.50 | |
| One fireman | 2.00 | |
| Four pitmen at $1.50 | 6.00 | |
| —— | ||
| Wages of crew | $15.50 | —— |
| $15.50 | ||
| One ton coal | $3.00 | |
| Oil and waste | .75 | |
| Water | .50 | |
| —— | ||
| Fuel and supplies | $4.25 | —— |
| $19.75 | ||
| Interest on capital, $6,000, at 6% | $1.00 | |
| Depreciation at 10% | 2.00 | |
| Repairs | 1.00 | |
| —— | ||
| $4.00 | —— | |
| Total daily expense with regular crew | $23.75 |
This will suffice for loading loose gravel; in the harder materials ordinarily occurring on construction work the following daily expenses must be met:
| Expenses of regular crew | $23.75 | |
| Foreman | $5.00 | |
| Two pole (or bank) men at $1.50 | 3.00 | |
| Two extra men at $1.50 | 3.00 | |
| One night watchman | 1.50 | |
| Powder and dynamite | 1.00 | |
| —— | ||
| $13.50 | —— | |
| Daily expenses on average construction work | $37.25 |
To the above must be added the expense of transporting the machine to the work, and returning.
The cost of hauling is also a variable item; it depends mostly upon the length of the haul, and on railways very largely upon the delays met with in going to and from the dumping place. On construction work it is seldom less than 3 cts. per cu. yd., and sometimes reaches 10 cts. On railways it is not often below 4 cts. for hauls up to 10 miles in length, and may reach 50 cts. or more for hauls of 75 miles or farther.