As I understand it, the protocol will be used by ERC20. But, now newer and more compatible protocols are being used. ERC223 for example. Faster and safer. Second question. How legal is the gold mining activity?
1) I don not really have answer for you here.
2) Paraguay Mineral Mining SA is a fully registered and licensed mining company. All our documentation for mining is as required by the government. PMMSA also pays wages, medical, social benefits etc. as stipulated by the government.