An example might be where a gold mining company (Company A) buys a stream of gold production from another company through an upfront payment, after which time it sells the gold received from the structured transaction. This gold should not form part of Company As gold sales for the purposes of AISC or AIC. Dec 19, 2012 These comprise differences in grade (metal content per ton) differences in the form in which the metal occurs . FCX_Freeport-McMoRan Copper Gold Inc. Our Metals, Copper . Copper concentrate is the most basic form of copper product sold by Freeport-McMoRan. We are one of worlds leading producers of copper concentrate. Nov 09, 2020 For investors interested in copper production, having a good handle on this information can be an important part of deciding which companies involved in copper mining are best to invest in. Types ...