Cotton & Western Mining Inc. (CWRN)

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If the mining company is producing,the Toronto(TSX)exchange(the largest in Canada) which is used by a lot of mining companies requires a certified geologist report-43-101. Otherwise,they do not.
I'm not familiar with the Brazilian.

TSX –Mining Companies Listing Requirements-In Production Mining Companies
3 years proven and probable reserves as estimated by an independent qualified person.

Commercial level mining operations.

Net Tangible Assets
$7,500,000

Pre-Tax Cash Flow
Last Year
$700,000 in last fiscal year and average of $500,000 for past two fiscal years.

Profitability
Pre-tax profitability from ongoing operations in last fiscal year.

Value of Free Trading Public Float
C$4,000,000
Form 43-101 Technical Report