砂積礦床

placer (alluvial deposit containing valuable metals)

bed / couch / classifier for beds / CL:張|张[zhang1]

variant of 床[chuang2]

sand / gravel / granule / variant of 沙[sha1]

to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing

ore / mine

(mineral) deposit