Answer: motherlode

AnswerCrossword Clue
MOTHERLODEMiner's dream
MOTHERLODE1982 adventure flick directed by and starring Charlton Heston
MOTHERLODEMajor supply
MOTHERLODEHeston film of '82
MOTHERLODEProfitable source
MOTHERLODESierra Nevada find.
MOTHERLODEBonanza
MOTHERLODEMain vein
MOTHERLODERich vein of ore
MOTHERLODEProspector's dream
MOTHERLODEPrime ore source
MOTHERLODEJackpot
MOTHERLODEIn the ..., there's the greatest concentration of ...
MOTHERLODEVein of ore
MOTHERLODEGold seeker's target