Group 4
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Deep levels elsewhere; Deep Syndicate Company; Development costs; Diamonds (early); Dip; Dividends; Dollar / Pound; Drills; Drill: Supervision; Drilling: Hand; Dykes & Faults; Dynamite.
Group 3
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Costs; Cross cuts; Cyanide; Deep levels.
Group 2
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Coal; Consolidated Gold Fields (Rhodes); Consolidated Deep Levels; Corner house; Rand mines.
Group 1
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Capital; Capital costs; Capital & labour saving; Central mining & investment corporation; Central ore reduction company; Chamber; Champ D'or Deep; Claims.
Group 3
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Albu (referred to General Mining & Finance Corporation); Alluvial gold; Amalgamation; Banks; Bewaarplaatsen; Barnato's; Bibliography/Literature review; Blasting; Boom 1891; Boom 1895; Bonanza; Boreholes.
Group 1
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Accounting; Adaptation; Advertisements; African estates agency; African labour.