Also associated with the granite batholith was the creation of mineral veins in parts of the Lake District.: The richest known lead vein of all was found crossing the south-east shoulder of Green Side. This, the Greenside Lead Vein runs in a north-south direction and dips steeply to the east at 70°. It was up to 59 feet (18 m) wide in the highest workings of the Greenside Mine, but averaged about 8 feet (2.5 m) wide in deeper workings. The vein contained galena in a mixture of quartz and smashed rock. Galena (lead sulphide) is an ore of lead. The ore from Greenside also yielded 10 oz of silver per ton of lead. Higher levels of the vein also contained quantities of baryte (barium sulphate), although at the time this had no commercial value. Very small amounts of blende (zinc sulphide) and chalcopyrite (copper-iron sulphide) were found in the deeper levels, but never in recoverable quantities.