Emerald green fluorite from the West Crosscut, photographed in artificial light. 10 cm wide. UKMV specimen. J. Fisher photo.

 　　During the late 1970’s a cavity containingsome exceptional bright greenfluorite was discovered near the surfacedirectly below the previously cut benchlevel on the Greenbank vein. Over thenext 18 months of only weekend work, anadit was driven northward for a distanceof about 20 meters in search of morefluorite at this level. Unfortunately, theadit proved barren for the rest of its length and no work has been done theresince.The focus of mining shifted back tothe upper level, and during the 1980’s anadit was driven northward into thequarry wall. Between 1982-1990, thepartnership was also engaged in a zincmining operation at Force Crag in Cumbria,so work at the Rogerley was limitedto one or two weekends a month. During this time a series of cavities along theadit produced a high volume of material,resulting in a steady cash flow for thecompany. Most of the fluorite specimensfound were large, opaque green crystals,some of which had smaller gemmy greencrystals on the surface. To the east ofthis section of the adit the fluorite crystalstended to become smaller and moretransparent, and some excellent quality specimens were recovered. By the early1990’s the adit had been extended to alength of about 35 meters, but during thewinter of 1992-93 the area around theportal collapsed, requiring the betterpart of the next year to reopen.