Geology Reference
In-Depth Information
In addition, known deposits are categorised into three classes: Class A for Com-
mercial Projects with Recoverable Resources, as is the case of E1 deposits and
projects F1; Class B for Potentially Commercial Projects with Recoverable Re-
sources when deposits fall into either category E1 or E2 and projects in F2; and
Class C for Non-Commercial and Other Known Deposits. In these three classes the
geological knowledge may be G1, G2 or G3 (Fig. C.1).
Fig. C.1 Abbreviated version of UNFC-2009, showing primary cases
Whilst the SNA limits the scope to commercially exploited deposits, the SEEA
provides a broader picture on the stock availability of resources generally. The latter
considers a mine's wealth in an economically simplified and present-day view, ignor-
ing the fact that geology is more complex than the statistics reflect. For instance,
there are many types of minerals and a multitude of combinations with specific
geological structures. Additionally, exploitation may result in recovering waste bur-
den, tailings and residues that were previously discarded as a function of market
demand. Furthermore there is no consensus internationally supporting a detailed
classification of mineral and energy resources suitable for statistical purposes.
Instead the SEEA simply proposes the compilation of the physical asset accounts
for mineral and energy resources by type, including estimates of the opening and
closing stock and any alterations over the accounting period. The crude units are
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