TUNNELS AND SLUICES.	235
	7=;6 feet from its mouth to a point of junction with the heading from the shaft, a distance of 851 feet; cost $30 08 per linear foot. The amount $17,557 30 is the cost of sinking the shaft 123 feet and driving a heading from it 93 feet to connect with the lower (tunnel) heading; cost $81 38 per linear foot. The amount for tunnel and shaft ($43,176 81) is the cost of the entire tunnel to the Milton Company. Previous, however, to the formation of this company the tunnel had been driven in 756 feet at a cost of about $25 per foot, or, say, $19,000; adding this $19,000 to the $43,176 81 expended by the Milton Company gives $62,176 81 as the total cost of tunnel and shaft, or nearly $35 per linear foot- The third item of $17,476 94 repre­sents the cost of construction of a tail sluice, 4,774 feet long, from the mouth of the tunnel to the Yuba River, 7 large undercurrents of the most approved pattern, and the labor of putting a flume in the tunnel 1,700 feet long. The three accounts summing $60,653 75 4"$I9)°00 Ctmnimt expended on tunnel before organization of the company), say $80,000, represents the entire cost of tunnel and sluices ready for washing. Size of tunnel, 8' X 8'.