Grid ref. indicates position of Main Shaft.

Situated near the summit of Boswin Downs, approximately 700 yards northeast of Porkellis Chapel, this mine incorporates the ancient workings of Wheal Puffet and St. Christopher’s. It was briefly reopened in 1907 but is now heavily overgrown, as of 2011. Despite the overgrowth, the main shaft remains open, and remnants of the concrete base of stamps are still visible amidst the vegetation, along with several well-preserved buddles.

There are no records of the early history of this old mine that was reopened in 1907 and worked successfully in a small way until 1915. The chief lodes then developed were Main or St. Christopher’s 1½ft. wide coursing E. 38° N. and underlying steeply north-west, and Puffet Well, a caunter lode 2ft. wide that trends E. 8° N., underlies 18° N. and intersects Main Lode in the west of the workings; both have well defined walls and carry quartz with cassiterite in greenish tourmaline peach; pyrite is present and there are traces of copper ores. North Prospect Lode, 145 yds. N. of and parallel to Main Lode and Gas Engine and New South lodes, respectively 20 yds. and 50 yds. S. of and parallel to Puffet Well were also tried underground.