Ua lako ka Hitachi 670 me kahi lima pōhaku kaiyuanzhichuang kipi, e wehe ana i kahi au hou o ka ʻeli ʻana.
ʻO Kaiyuan Rock Arm, ma ke ʻano he lima i hoʻololi ʻia no nā kumu he nui, he kūpono ia no ka eli ʻana me ka ʻole o ka pahū ʻana, e like me nā lua lanahu hāmama, nā lua alumini, nā lua phosphate, nā lua gula one, nā lua quartz, a pēlā aku. He kūpono hoʻi ia no ka ʻeli ʻana i nā pōhaku i loaʻa i ke kūkulu ʻana maʻamau e like me ke kūkulu ʻana i ke alanui a me ka ʻeli ʻana i ka lua, e like me ka lepo paʻakikī, ka pōhaku i hoʻopau ʻia, ka shale, ka pōhaku, ka pōhaku limestone palupalu, ka one pōhaku, a pēlā aku. Loaʻa iā ia nā hopena maikaʻi, ka ikaika o nā lako, ka haʻahaʻa o ka hāʻule ʻana, ka pono o ka ikehu kiʻekiʻe i hoʻohālikelike ʻia me nā hāmare haki, a me ka walaʻau haʻahaʻa. ʻO Rock Arm ke koho mua no nā lako me nā kūlana pahū ʻole.
