Ann: Ministerial Decree Received to Award the Mining Licence, page-327

who knows where this 15% is actually but idle speculation at present and hopefully sorted out in due course

if you want to know more DRC own 90% Cominiere and I believe 10% by a local social security fund
see en.wikpedia.org/wiki/Cominiere You may need to type this into your browers

extract from today's announcement

AVZ’s Majority Interest in the Manono Project Following the official award of the Mining Licence, and under the terms of the Joint Venture Agreement, La Congolaise D’Exploitation Miniere SA (Cominiere) who owns 25% of Dathcom will cede 10% of its interest to the DRC Government. AVZI is in advanced discussions with the DRC Government regarding the purchase of Cominiere’s remaining 15% interest in Dathcom exercising AVZI’s rights under terms of the existing Dathcom Shareholder Agreement.