There is no minimum investment By investing in this smart contract you are buying Virtual mining rig which will bring you daily mining profits depending from size of your mining rig (Daily interest rate 3.6% from the amount transferred to 'Daily CMT' smart contract.)
Biggest mining rig available cost 50.00 ETH , if you are trying to buy bigger miner then 50eth your transaction will be rejected. Mining Profits are paid by smart contract until there is enough funds in contract.
You can sell your mining rig back to smart contract at any time by sending 0 transaction to contract with HEX data '0xe9fad8ee' and contract will buy back your mining rig for 50% of your investment. UNLESS your mining is made mining profits more than 50% from your investment.
To maintain your mining farm , every day you have to withdraw your funds, if you will not withdraw your funds and don't clean your mining farm your mining rigs will switch OFF and there won't be any daily interest rate profit till you clean your farm and withdraw your mining profit.
This contract has referral system, when you refer new miner to this contract you will receive 10% ethereum from his investment in mining farm to get referral link you need to invest more than 0.1 ETH.