gravel and sand mining in bruneidredging Companies in Brunei Darussalam - Environmental Expert. 133 Results Serving Brunei . Sand & Gravel Mining in the US Market Research | IBISWorld.gravel and sand mining in brunei,Find Mining expertise in Brunei DarussalamBrunei possesses a small mineral industry. The main minerals mined in Brunei include: carbonate rocks, coal, sand, gravel and silica sands. The limited extend.