GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Definition: Y chwilio a'r profi a wneir am adnoddau naturiol mewn ardal benodedig, er mwyn penderfynu a ydyw gweithgareddau mwyngloddio neu echdynnu yn fasnachol hyfyw.