Ah, was a bit too far north, Littlehoughton is nearer Alnwick, I've now found -
A vein was discovered in a small colliery between Rock Hall & Rock Moor House during the 18th C. The vein runs nearly SW to NE and having been found in working the coal upon a bed of sandstone. The ore is stated to have yielded only 10 oz of lead from sixteen oz of ore, and scarcely any silver at all.
A vein outcropping in the vicinity of Little Houghton was tried in the 18th C. and was described by Wallis as follows:-
A string or small vein, was lately discovered in the middle of the villa of Little Houghton: the ore, lodged in coarse spar, talc, and ordinary marcasite, found near the day. In good esteem, and was worked by the owner, Mr Henry Penreth, for some time, but now discontinued after a few trials.
Those refs. should keep you busy for a day or so, now off you go - we shall await a full report on all those locations in due course !!!!