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316 REPORT OF STATE MINERALOGIST.

on the O. K. Vein. Development consists of 2 tnnnels 150 and 200 feet
in length. The occurrence of cobalt has also been noted in the ore.

Bibl: State Mineralogist's Report XI, p. 245.

Lost Treasure Mine. (Silver.) This property is situated 6 miles
northeast of Azusa in San Gabriel Canyon. Holdings comprise 4

claims. Owners, Messrs. Holcomb, Barber and Fairs, Azusa, Cali-
fornia. Prospect.
Bibl: State Mineralogist's Report XVIII, p. 422.

Benton Vein Mine. (Lead-Silver-Zinc.) It is located 2 miles south-
east of Avalon, in Renton Canyon, on Santa Catalina Island. Eleva-
tion 700 to 1100 feet. Owner, Santa Catalina Island Company;
William Wrigley, Jr., president; D. M. Renton, vice president and
general manager; David Fleming, secretary; E. H. Pattison, consulting
engineer.

Five parallel veins occur in andesite. These veins strike east and
dip 60° north, and vary in width from 4 to 6 feet. The ore is sphalerite
and galena with silver values. It carries 8 to 12% zinc, 1^ to 2%
lead, with values in silver.

Development consists of 4 tunnels on the Renton vein. No. 1 Tunnel
is 200 feet, No. 2 Tunnel is 225 feet. No. 3 Tunnel is driven northwest
as a crosscut 645 feet to vein, with drift on the vein 130 feet. No. 4
Tunnel, the main working tunnel, is driven south as a crosscut 400 feet
to the vein, with drift on the vein of 150 feet, developing a shoot of
ore 130 feet in length with an average width of 6 feet. Two other
tunnels are being driven on parallel veins at a lower elevation. The
ore from these workings is trammed through tunnel No. 4 to storage
bins, from which it is transported by aerial tram 3700 feet to a stor-
age bin at Pebble Beach, which has a capacity of 225 tons. Twenty
men are employed.

Quarry Mine. (Lead-Silver-Zinc.) It is located on Santa Catalina
Island west of the rock quarry, 1\ miles southeast of Avalon and
southwest of Pebble Beach. Elevation 300 feet. Owner, Santa Cata-

lina Island Company; William Wrigley, Jr., president; D. M. Renton,
vice president and general manager; David Fleming, secretary; E. H.
Pattison, consulting engineer.
The vein is exposed along the face of the rock quarry. It strikes east
and dips 70° south, in andesite. A series of north and south shear
zones cut off the ore-shoot but do not displace the vein to any extent.

A tunnel has been driven east 489 feet on the vein. At 310 feet from
portal, a winze has been sunk on the vein to a depth of 250 feet. Two

levels 85 feet apart have been driven from the winze on the vein, each
350 feet in length. The ore-shoot developed is 150 feet in length and
has an average width of 4 feet. The ore mined carries 9% zinc, 1J to
2% lead and 3 oz. in silver per ton.

The ore from mine bins is hauled by truck to main storage bins at
Pebble Beach. From these bins the combined ore from Renton Vein
Mine and Quarry Mine is loaded onto a barge having a capacity of

250 tons by a system of belt conveyors. The ore barge is towed by
tug to the 100-ton flotation mill at White's Landing.