The answer is in this article from March, the link for which you provided.

"Through the platform, Canadian investors can access financing deals offered by mining and resource companies."

For US-listed companies, change must first come from the US Securities and Exchange Commission (aka, the SEC). In other words, crowd funding is not legal in the US at this time for US-listed corporations.

...the subject has been discussed here a few times, but I'm sure we all thank you anyway for thinking of asking the company, and please forgive me for answering when you addressed your question to them.

VP in AZ