| 1 | All the easy gold has been mined already. | |
| 2 | An area containing abundant deposits of gold or gold ore. | |
| 3 | Many people prospected for gold in California in the 1850s. | |
| 4 | This new invention will bring you great profits like a goldmine. | |
| 5 | That makes it even less likely that they will find much more gold. |
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