| mine(verb, turn, produce, clean, discover) |
| penetrate(verb, turn, produce, clean, discover) |
| pierce(verb, turn, produce, clean, discover) |
| pit(verb, turn, produce, clean, discover) |
| probe(verb, turn, produce, clean, discover) |
| produce(verb, turn, clean, discover, find) |
| quarry(verb, turn, produce, clean, discover) |
| root(verb, turn, produce, clean, reveal) |
| root out(verb, expression, turn, produce, clean) |
| rout(verb, turn, produce, clean, discover) |
| sap(verb, turn, produce, clean, discover) |
| scoop out(verb, expression, turn, produce, clean) |
| see the light |
| sift(verb, turn, produce, clean, discover) |
| spark |
| spotlight |
| strike |
| stumble on |
| till(verb, turn, produce, clean, discover) |
| tunnel(verb, turn, produce, clean, discover) |