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田东膨润土矿是１９７８年发现，１９８３年勘查评价的一个中型规模矿床。它受右江大断裂控制的第三纪陆相半地堑式断陷盆地（百色盆地）田东凹陷中；矿层赋存于第三系含煤岩系建造的泥岩中，有矿８层，主矿层面积达８．４２ｋｍ￣２，矿体呈层状、似层状与围岩产状一致；矿石有斑脱岩（膨润土）与蒙脱石泥岩两类，具泥质、晶屑凝灰结构与层状、块状构造，矿物成分为蒙脱石（＞７０％）和水云母、水黑云母、石英、长石、缘泥石等，化学成分含量（％）：ＳｉＯ＿２４７～６５．５０、ＴｉＯ＿２０．２４～１．１５、Ａｌ＿２Ｏ＿３１５．７３～２６．６８、Ｆｅ＿２Ｏ＿３２．７９～６．７９、Ｃａｏ０．８３～１．４３、Ｍｇｏ１．１１～４．１１、Ｋ＿２Ｏ０．６１～２．６４、Ｎａ＿２Ｏ０．１３～０．３７，矿石属性随埋深而异，认为属内陆湖相火山－沉积矿床。指出膨润土具有强的吸水性、膨胀性、胶结性、润滑性、分散性和阳离子交换等物化性能，因此它广泛应用于冶金铸造、钻井泥浆、石油化工、轻工、建筑和衣牧业；由于矿床所处特殊地理位置优势，它的开发利用具有广阔前景。
Tiandong bentonite ore is found in 1978, 1983, a large-scale exploration and evaluation of mineral deposits. It is controlled by the Youjiang Fault Tertiary continental facies graben fault basin (Baise Basin) Tiandong sag; the ore layer occurs in the Tertiary coal measures built in the mudstone, with 8 layers of ore, The main seam area of 8.42km ~ 2, the ore body is stratified, like strata and the occurrence of the surrounding rock; ore has bentonite (bentonite) and montmorillonite two types of muddy, Its composition is montmorillonite (> 70%) and water mica, water biotite, quartz, feldspar and marginal mudstone with chemical composition content (%): SiO_247 ~ 65.50 , TiO_20.24 ~ 1.15, Al_2O_315.73 ~ 26.68, Fe_2O_32.79 ~ 6.79, Cao0.83 ~ 1.43, Mgo1.11 ~ 4.11, K_2O0.61 ~ 2.64, Na_2O0 .13 ~ 0.37. The properties of ore vary with burial depth and are considered as inland lacustrine volcano-sedimentary deposits. It is widely used in metallurgy casting, drilling mud, petrochemical industry, light industry, construction and animal husbandry because of its strong water absorption, expansibility, cementation, lubricity, dispersibility and cation exchange. Deposits located in the special geographical advantages, its development and utilization has broad prospects.