I can only locate the following newspaper article possibly relating to the mine in question: -
A Steam Engine for Sale by Private Contract - For Sale, One 17-inch Cylinder Pumping Engine, applied to work double, equal to the duty if 24-inch, with a very good Boiler, about 6 tons.
Also, 20 fathoms 5-inch Plunger Lift complete; 7 fathoms of Bucket Rods; 7 cwt. Connection and Bucket Plates, and sundry other Mining Materials.
Apply at Trevellans Mine, to Captain John Murrish, or for further particulars to Mr. W.H. Vice, Truro, or Capt. Rowe, St. Agnes.
Dated Truro, 14th October 1846.
Royal Cornwall Gazette - Friday 27th November 1846