The Haddon Great Extended GMC was formed sometime in the 1870s for the purpose of mining 270 acres of land lying to the south-west of the Racecourse Company (who at that stage had a shaft at the depth of 86 feet)A printed piece of paper with a prospectus on the left and a plan on the right. The plan includes a shaded area representing the Haddon Great GMC, and shows neighbouring companies such as Racecourse GMC, Haddon Consols, Reform GMC, Haddon Co, and also shows Russel's Private Propert and Roach's Private Company, and the Trap-Rock Formation.haddon great extended gmc, wc elder, william levey, c thorburn, john langdon, hb forster, national bank of australasia, haddon, racecourse company, h.b. forster, w.c. elder, john langdon, william levey, c. thorburn, john langdon, shares, racecourse goldmining company, reform gold mining company, haddon consols, haddon great extended gold mining company, russell