Lub Hnub Qua Grace Mining Co., Ltd, tau tsim muaj hauv 2003. Peb tau koom rau hauv exloiting mine thiab ua tau lub pob zeb zoo siab, cov khoom tseem ceeb: Magnesium oxide (Caustic calcined magnesite), magnesium sulphate heptahydrate, kieserite, Tuag tuag magnesiite, Fused Magnesite thiab Brucite.
Kev nyeem ntawv yog qhov nrov heev hauv peb lub tuam txhab. Peb tseem kawm thiab kev txhim kho. Yog li ntawd peb tau muab cov kev pabcuam zoo tshaj plaws rau cov qhua tuaj noj mov. Ntawm no los cov duab hauv qab no:
