Quick look at the latest 10-Q. Bottom line number on Promissory Notes is that currently (as of Sept. 30, 2017), $2,631,179 worth of Promissory Notes remain outstanding.
My take is that LEXG is up to their eyeballs in debt. Seems some debt is being converted to Preferred shares (70,000,000 shares Series C). LEXG current liabilities are pegged at about $6M, most of which is debt.