Site alleged to exist. To illuminate, I think it’s fair to reproduce the entire extract on Pantku from Bick.

Trials were in progress elsewhere..

Am sorry to say Gutter Coch is not turning out much ore. Pantku is looking just the same as when Mr. Petherick was here, which he did not think much of, but I think the men will make wages at it. Llwydd men are still going on bit are not doing much good for themselves.

But by October 1858 there were..

parties willing to take Pantku again at 1/8th of the ore for your portion if you will let it for six or twelve months.

The site of Pantku is said to be high above the road (624504) behind Bryn Dinas.