Peb lub tuam txhab tshwj xeeb hauv kev tshawb fawb thiab kev tsim khoom, kev tsim khoom, kev tsim khoom thiab kev muag khoom ntawm cov khoom siv excavator. Cov khoom tseem ceeb yog pob zeb diamond caj npab, qhov av caj npab thiab rauj caj npab. Cov khoom lag luam tau siv dav hauv kev tsim kho txoj kev, kev tsim kho vaj tse, kev tsim kho tsheb ciav hlau, kev khawb av, permafrost stripping, thiab lwm yam. Kev tsim kho pob zeb tsis muaj kev tawg.
