With respect to the 5% dividend, I haven't checked the legal structure but suspect that Camiron actually owns the resource and therefore future Mbalam mine, with Sundance and the Govt as shareholders in Camiron. Therefore the 5% tax would apply to dividends paid by Camiron to its two shareholders being Sundance and Govt company setup to hold their investment.
DYOR though, maybe something different
Cheers
SDL Price at posting:
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