If you're a fan of mining, then you'll be happy to know that Held-By-Production clauses allow miners to extend their land leases after they expire, as long as the mines are still productive. This means that you can continue to mine for oil, gas and minerals without having to worry about your lease running out.Of course, this isn't a free pass to keep mining indefinitely. The held-by-production clause only applies if the mine is still productive – so if it runs dry, you'll have to find somewhere else to set up shop. But as long as there's still ore in those hills, you can keep on mining!