Minerals and metals are very valuable commodities.  For example, manganese is a key component of low-cost stainless steel.  It is also used to de-color glass (removing greenish hues), but in higher concentrations, it actually makes lavender-colored glass.  Mining is generally very destructive to the environment.  It is one of the main causes of deforestation.  In order to mine, trees and vegetation are cleared and burned.  With the ground completely bare, large scale mining operations use huge bulldozers and excavators to extract the metals and minerals from the soil. As the selling price of the mineral rises or the extraction costs fall, the proportion of the mineral inventory classified as ore increases. This information can be published in our peer reviewed journal with impact factors and are calculated using citations not only from research articles but also review articles (which tend to receive more citations), editorials, letters, meeting abstracts, short communications, and case reports. The inclusion of these publications provides the opportunity for editors and publishers to manipulate the ratio used to calculate the impact factor and try to increase their number rapidly. Impact factor plays a major role for the particular journal. Journal with higher impact factor is considered to be more important than other ones.