Note: Following description is from Mindat. For the avoidance of doubt, mineral collecting in the Caldbeck Fells is only allowable under license, which are granted for specific zones.

Situated in Swinburn Gill, a minor tributary to the Dale Beck valley in the northern Caldbeck Fells, Cumbria. The mine focused on exploiting an approximately WNW-ESE trending quartz-baryte-chalcopyrite-galena vein, primarily located on the west side of the gill. Over time, the primary minerals underwent alteration due to a period of supergene enrichment, followed by prolonged intense oxidation.

Interestingly, the vein lacks carbonates, which has resulted in the oxidation giving rise to a collection of rare minerals. Among these minerals are excellent specimens of caledonite, leadhillite, and especially linarite, which have been collectible until fairly recent times.

1863-1872 Red Gill Mining Co.