Measured Mineral Resources: If sampling is complete and from four directions of the mass, accurate form, tonnage and grade are determined via the obtained data. This resource is called “measured mineral resource”. If it is exploited under mining conditions (technologic, economic, etc.) it will change to proved mineral reserves. To change a mineral resource to a mineral reserve, certain factors are considered which are as follows;
Metallurgical, economic, marketing, environmental laws, social and governmental factors etc.
Discontinuation of operations among the stages of indicated, measured and probable will cause a reserve to be abandoned. In this project, these reserves are examined parallel to the abandoned mines.
With regard to the governing economy conditions and available technology, in the developed countries, abandoned mines are called the mines that the economic part of their reserves can be exploited. The availability of other conditions has caused that the definition of abandoned mines becomes vaster. One of the first and fundamental issues is the ignorance of the systematic exploration in Iran, and there is no definite boundary between reserves and mineral resources. Many a mine that few exploration data respecting them are available, and as a result no definition about mines is presented. Some of the mines are not presented as mines, and sometimes some of the indices or ore-deposits, which were not under exploration process for minerals and regardless of their economic conditions are presented as mines. As a result, there is no definite and standard process for abandoning the Iranian mines.
In Iran, different issues have roles in abandoning the mines, which are political, cultural, industrial, technological and economic etc. On the other hand, most of the mines which are abandoned now, because of running out of their reserve and mining process did not close. It is possible to be hopeful that reserve is still available in some parts of them.