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CHAP. VIII.
MINERAL VEINS.
181
| GROUND FLAN OF HUEL PEEVER. | |
| a, a′, a″. Tin vein worked. | d. South ditto. |
| b, b″. Copper vein, called "John's Gossan." | e. Copper vein. |
| c. North "slide." | f. Vein of clay. (Elvan.) |
| x, y, z. Cross courses. | |
The ordinary explanation is that the tin vein, now
appearing in four parts, a, a″, a″, a‴, is the oldest
vein, and was formed in one straight line; after its
formation the copper vein b b″ was formed by filling a
straight continuous fissure, which was made by violent
fracture of the mass of the rocks across the tin vein.
This was accompanied by a dislocation of the rocks in closing
the tin vein; so that the line was broken and
