Coal Mining Equipment

Canada April Gross Domestic Product Report (Text)

The following is the text of the April GDP report released by Statistics Canada .

Real gross domestic product was unchanged in April after increasing 0.3% in March. Both the goods-producing and the services sectors remained unchanged in April.

Significant increases were recorded in mining of metal ore and coal. Retail trade, the public sector, construction and utilities also advanced. However, this growth was offset by declines in manufacturing and, to a lesser extent, in wholesale trade and the finance, insurance and real estate sector. Transportation services were unchanged.

Mining rose 1.0% in April, primarily on the strength of copper, nickel, lead and zinc mining. Coal mining also contributed to this growth. Support activities for mining oil and gas extraction continued to advance. Overall, oil and gas extraction was down 0.3%, as a reduction in natural gas production outweighed higher production of crude petroleum.

Motor vehicle and parts production leads the decline in manufacturing

Manufacturing decreased 0.7%, with most of the decline concentrated in the production of durable goods. The 6.9% decrease in motor vehicles and parts production was mostly due to supply disruptions as a consequence of the tsunami in Japan . This decrease, combined with lower production of aerospace products, led to a 4.7% reduction in manufacturing of transportation equipment.

Manufacturers of furniture and related products, printed products and electric equipment also cut back production. Conversely, manufacturing of machinery, notably of mining and oil and gas machinery, and of food products increased.

Retail trade increased 0.5% in April after declining 1.2% the month before. Increases were registered at furniture and home furnishings stores, new and used car dealers as well as at clothing and accessory stores. In contrast, activity at building material and garden equipment and supplies stores was down.

Wholesale trade decreased 0.5% in April. Wholesalers of motor vehicle and parts, petroleum products and building materials reported declines. Conversely, wholesaling of food, beverage and tobacco products as well as of personal and household goods and of machinery and equipment increased.

Construction edged up 0.1% following the 0.9% increase in March. Engineering and repair work grew while residential construction declined on account of decreases in single dwellings, renovations and apartments.

Energy consumption control in opencast coal mining | Mining Machinery

ABSTRACT: Opencast mining is highly mechanized technological process which, due to low manpower, high production outputs and engagement of heavy-duty mining mechanization requires a very high consumption of power, spares and materials. Those facts indicate that rationalization of the consumption of power and materials requires specific attention in scientific senses.

This paper systematizes all factors which may contribute to harmonization between functional dependence of the development of technology and consumption of power. A separate model is also proposed for analysis and monitoring of consumption of power which enables, to a maximum possible extent, adaptation of opencast mining of mineral materials to request of the 21st Century, which will be particularly rigorous from the aspects of consumption of power.

General prognosis that deals with the development of surface exploitation of coal in Yugoslavia, along with ecological issues also covers large energy and materials consumption in this field as a strong limiting factor. Such estimation is based on the ever increasing requirements for energy. spare parts and various materials that in surface exploitation of coal are growing with increase of the physical volume of production.

The complex analysis of the factors influencing consumption of energy and materials in the surface exploitation recognizes three groups of main factors such as natural. technological and organizational. The group of natural factors covers separation of deposits, relief of terrain, coefficient of overburden, physic-mechanical properties of the deposit, depth of mining, mineral materials quality and length of transportation roads. Technological factors include structural equipment design, project designs. installed power, method of excavation, loading and transportation, method of piling, development of excavated faces, useful value of mined materials and mineral processing. Quality mineral materials and the length of transportation roads can also be listed among the technological factors. The organizational factors are represented by: managing of process, qualification of stuff, maintenance of mechanization and monitoring the energy as well as material consumption.

Evaluation of the existing position of energy and material consumption at open pit mines in Yugoslavia under the stated influential factors, indicates that the possibilities for consumption are present. The consumption could be realized if the whole problem is thoroughly studied and if systematic monitoring, analyzing and planning all the standards as concerns the conditions characteristic for the open pit is provided for. The existing Yugoslav practice applied in the surface exploitation, the principles of planning and monitoring the energy and material consumption have not been regulated by the unique methodology. The principles of planning the material consumption have mainly been grounded on monitoring the empirical indicators. The data from previous years arc mostly taken and the consumption used is divided into the realized production and in a such a way the value of consumption per production unit is obtained. Such a way of planning the consumption permitted a constant struggle for achieving better results than during the previous year but it lacked professionally and scientifically defined methodology of real planning. Thus similarly the monitoring of energy consumption is carried out. While monitoring electric power consumption the data used refer to periodical control of such energy consumption and a comparison with the planned quantities was accordingly made, having in most cases quite a negative effect, as the adequate interventions failed when a large consumption was in question. Somewhat less complex system of evidencing was applied when monitoring fuel consumption, particularly in case of open pits having their own pump stations. Rarely, complex factors influencing the consumption of energy and material were analyzed such as the efficient technological processes and efficient organization of labor. Since recently, consumption of energy and material at open pits in Yugoslavia has become more actual.

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