Different Stock Exchanges for GGG Greenland Minerals

Anybody,

I am a little baffled and concerned how/where I am invested in the GGG/GDLNF Greenland Minerals stock. The concern is this: I have a significant number of shares in GDLNF with the OTC which is an American/USA stock exchange. The volume and consequent share prices with the OTC.com do not truly reflect the volume action as posted for GGG with the ASX with much, much greater volume and quite often different price quotes (For example..the OTC stating a loss for the day when the ASX stating a gain for the day and vice versa).

I do know that there is a currency difference between the American dollar and the Australian currency.

Should I be doing my trading with the ASX instead of the OTC for this stock or maybe with Interactive Brokers or ??? My broker is Schwab but I do my own investment decisions and executions and do not involve a broker rep from Schwab for my trades.

Please advise.

Thank you.

Jack