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After the negotiations with my mom were done, the robots immediately started working. The contract did say she would be paying upfront a part of the payment, although it was rather ambiguous how much she would pay upfront.
And although she had ready a big amount of ores to pay the robots, which she did, she told me she wanted to at least pay them 30% upfront. And yes, the robots actually wanted all the payment on raw ores, any ore, as long as they were ten tons of it. Mixed ores I suppose.
That's why my mother just offered me yet another contract, to me of course.
"Wait, huh?"
"This is a contract to buy you the required amount of ores we need."
"Wait mom, but I don't know if there are enough down there yet!"
"We can go check! If there are, then you can sign the contract."
"Eeeh.. Okay then." I shrugged. "But you're being a bit pushy about this, you know?"