pay dirt

(US) earth containing enough ore to make mining profitable （有开采价值的）矿石, 矿砂.

pavement, pavement artist, pavilion, paving, paving stone, pavlova, paw, pawkily, pawkiness, pawky, pawl, pawn, pawn-ticket, pawnbroker, pawnshop, pawpaw, pay, pay attention to, pay attention to sth., pay back, pay for, pay for sth, pay for sth., pay honour to, pay off, pay out, pay phone, pay phone (US `pay station), pay respect to, pay sth in; pay sth into sth, pay sth out, pay the price, pay up, pay-as-you-earn, pay-bed, pay-claim, pay-day, pay-off, pay-packet, pay-slip,