Hais txog kev tawg pob zeb, Cater 395 excavator nrog Kaiyuan pob zeb caj npab tau ua pov thawj tias muaj peev xwm ua haujlwm tau zoo heev.
Rock Arm, ua ib lub caj npab hloov kho ntau lub hom phiaj, nws tsim nyog rau kev khawb av yam tsis muaj kev tua phom, xws li cov chaw khawb thee qhib, cov chaw khawb txhuas, cov chaw khawb phosphate, cov chaw khawb xuab zeb kub, cov chaw khawb quartz, thiab lwm yam. Nws kuj tsim nyog rau kev khawb pob zeb uas ntsib hauv kev tsim kho yooj yim xws li kev tsim kho txoj kev thiab kev khawb hauv qab nthab, xws li av nplaum tawv, pob zeb uas tau hloov pauv, shale, pob zeb, limestone mos mos, sandstone, thiab lwm yam. Nws muaj cov txiaj ntsig zoo, lub zog ntawm cov khoom siv siab, qhov tsis ua haujlwm qis, kev siv hluav taws xob zoo piv rau cov rauj tawg, thiab suab nrov qis. Rock Arm yog thawj qhov kev xaiv rau cov khoom siv uas tsis muaj kev tua phom.
