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(...continued) After 1855, an adit known as the Big Tunnel was driven to intersect five ore bodies, the Brennan, Side Hill, Teabo, Small and Jugular veins respectively. At each of the veins, the ore was hoisted up to the adit level and transported out the tunnel. The Teabo vein was later referred to as the Finley vein. The adit was 504 feet long upon reaching the Teabo vein. Prior to 1868, the Teabo and Brennan veins were also opened further northeast by shafts. Particularly at the Brennan vein, these shafts showed the ore to be quite variable in thickness. In some places it was 17 feet wide, while in others, the ore pinched to about 1 to 2 feet. The mine was producing 72,000 tons of ore annually by 1868.
A very important vein worked was the Elizabeth which was actually an ore shoot of the Teabo vein. Its thickness ranged from 6 feet to 25 feet, dipped 72 degrees southeast and pitched 25 to 35 degrees northeast.
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