Эта книга — увлекательное путешествие в мир драгоценного камня, полный красоты, тайн, очарования и поэзии. В ней рассказывается о свойствах, условиях образования и об использовании ограночных самоцветов, содержатся интересные сведения об украинских камнях — берилле, гранате, топазе, аметисте, горном хрустале и др. Показана роль самоцветного камня в истории культуры.
Рассчитана на широкий круг читателей.

В книге изложены процессы дробления и грохочения углей на сортировках, углеобогатительных и брикетных фабриках. Рассмотрены элементы теории по дроблению и грохочению, конструкции современных дробилок, грохотов, магнитных сепараторов и питателей с указанием их технической характеристики, области применения и способов регулирования.

Mining operations have been seen by environmentalists and conservationists alike as causing problems. Undoubtedly, the operations of metal and coal producers have caused varying degrees of environmental damage in mining areas, which are often located in remote regions. In the urban, suburban, and rural settings of agricultural communities, the operators of rock quarries, gravel pits, and certain industrial mines have been considered the more visible and significant offenders.

A geological map is a medium of communication that uses graphic symbols to represent spatial relationships among geographical and geological feautures. Lines, points, symbols, and texture markings are used to separate various classes of information. But the interpretation of geological maps goes beyond identifying the individual items displayed on the map. A connection must be made between what is perceived on the map and other knowledge. The interpretation of geological maps is basically an attempt to visualize and understand the complex shapes of rock units in the subsurface. A thorough understanding of the variety of geological structures is particularly important, because it helps to determine the nature of subsurface structures from geological maps. Structural geology, therefore, is a major cornerstone of the art of geological map interpretation. <...>

Heat flow data have been used extensively by geoscientists to provide an indication of temperature variations within the Earth. However, there are relatively few experts available with the necessary experience to provide a critique of the central constraints or to obtain new data for second-order models. Terminology relating to thermal conductivity, diffusivity, vitrinite reflectance, xenolith geochemistry, and so on, is widely recognised but poorly understood, particularly by industry professionals.

Geologists are mainly concerned with the study of the lithosphere. The sedimentary and metasedimentary rocks, although they constitute only 5 % of the lithosphere by volume, they occupy 75% of the exposed land area (PETTIJOHN, 1957). Thus, the study of sedimentary rocks is the major problem of geology. An obvious question arises in the study of sedimentary rocks: Under what conditions and by which processes were the sedimentary rocks in question deposited.

Palynological methods are extensively used in Quaternary biostratigraphical investigations. The application of palynology in Pleistocene stratigraphy, including glacial deposits, is connected with some special problems. Intensive geological processes affecting the formation of autochthonous pollen spectra and the break up, rebedding and transport of pollen-bearing sediments complicates the interpretation of the stratigraphy considerably. Therefore attention has been focused on methodical problems.

In a country like India various types of earth science data have been generated for about 170 years by the Geological Survey of India (GSI) and subsequently by its much younger sister organizations like Oil and Natural Gas Corporation, Indian Bureau of Mines, Atomic Minerals Division, Central Ground Water Board etc. and a number of public sector undertakings like Hindustan Copper Limited, Hindustan Zinc Limited etc. In addition to these various earth science related organizations, State Departments of Mines and Geology and a number of academic institutions and Geology Departments under the various universities and Indian Institute of Technologies have come up after the independence of India.

The book lays emphasis on ore deposit set ups, structural permeability and proximity indicator minerals that have relevance in assessing mineral potential of prospective terrains. It also covers aspects of geophysical framework, data acquisition and challenges posed by the declining rate of new mineral discoveries of economic significance.