Wɔde mfiri a ɛtwe ade ba fam no di dwuma kɛse de yɛ kɔbere, dwetɛ, tin, tungsten, tantalum, niobium, titanium, zirconium, primary ore ne chromium placers.
medium a wɔde di dwuma wɔ . Jig afiri betumi ayɛ nsu, na sɛ wɔde nsu di dwuma sɛ ade a wɔde yiyi nneɛma mu a, wɔfrɛ no hydraulic jigging.Yɛn jig concentrators no yɛ nea nsu a ɛrebɔ denneennen, a ɛma mpaapaemu pɛpɛɛpɛyɛ tu mpɔn wɔ nneɛma ahorow mu.