The mining of oil shale in northeastern Estonia has also left large mounds of limestone tailings and ash dotting the region.

The mining of chalk since the early 18th century has left unrecorded underground galleries that occasionally collapse unexpectedly and endanger buildings.

He briefly joined the board of the mining conglomerate Lonrho in 1975 but left after a disagreement.

* Intensive phosphate mining during the past 90 years has left the central 80 % of Nauru a wasteland and threatens limited remaining land resources.

Thus, Nauru was left to handle the immense and expensive task of restoring large chunks of land which were destroyed by the mining.

Many mountains and mountain ranges throughout the world have been left in their natural state, and are today primarily used for recreation, while others are used for logging, mining, grazing, or see little use.

In addition, the many years of mining left behind substantial contamination of the soil and water, so that the Environmental Protection Agency designated some former mining sites in Leadville as Superfund sites.

The method is similar to cut and fill mining with the exception that after being blasted, broken ore is left in the stope where it is used to support the surrounding rock and as a platform from which to work.

The county's topography also features many " strip cut " lakes, lakes left behind following above-ground coal mining.

Coal mining did not last past the 50's and with the loss of coal mines, businesses vanished and people left.

When the mine was filled with water, construction equipment and mining tools were left on the bottom, and are present today.

The demographic and economic decline beginning in the 1950s with the end of the coal mining industry has left its mark on education.

In 1970, the Secretary of Mines for Pennsylvania suggested that so many underground voids had been left by mining underneath Scranton that it would be " more economical " to abandon the city than make them safe.

Borst wrote to Will Taylor, who had left the area to go mining in California, and offered him the Peterson place in exchange for labor.

The time that Carbonado did spend as a coal mining town is forever kept by the a cemetery, abandoned mines, a grown over coal slag pile, a school, and the company houses left behind.

The ore deposits left from Montreal's mining days can still be seen from Wisconsin Highway 77.

The underground prison was shot in real caves left by mining at Griffith Park, in the Bronson Canyon, previously used as the Batcave and in the 1930s Flash Gordon serial.

However, the building of the Manchester, Sheffield and Lincolnshire Railway line parallel to the canal ( 1849 ) left much of the navigation redundant, and the Worksop to Chesterfield stretch ceased to serve commercial traffic in 1908, when problems with mining subsidence necessitated the closure of Norwood Tunnel.

Gold mining damaged water supplies and killed fish ; the deer left the area.

In 1718 twelve German emigrant families left the employ of Governor Alexander Spotswood and the mining settlement of Germanna for a parcel of land in modern southern Fauquier County.

In deep mining, the room and pillar or bord and pillar method progresses along the seam, while pillars and timber are left standing to support the mine roof.

The governor and the mining companies, fearing a breakdown in order, left two Guard units in southern Colorado and allowed the coal companies to finance a residual militia consisting largely of CF & I camp guards in National Guard uniforms.

His Ministers of Economy and Finance ( notably Miguel Boyer, Carlos Solchaga and Pedro Solbes ) implemented a vigorous program of economic reforms that included privatisation of public companies such as Telefónica or ENDESA, liberalisation and deregulation of the economy and restructuring of whole industry sectors such as steel or mining which left many people unemployed and created resentment among the working classes and the trade unions.

Yet another concern is the ecological damage that resulted from a century of phosphate mining.

However, the need to respond to environmental concerns over the country's globally recognized ecological heritage, may increasingly need to be factored into capitalization of mining operations.

The Kola Peninsula as a whole suffered major ecological damage, mostly as a result of pollution from the military ( particularly naval ) production, industrial mining of apatite, and military nuclear waste.

Nickel mining has led to ecological problems in the area.

The elements and compounds uncovered and liberated through mining and processing, which are not usually part of the ecological systems ( in such a form or concentration ) have the potential to alter the receiving environment to its detriment.

Because of the valuable fishery in the river and also because of the history of heavy metal mining in the catchment of the river, extensive ecological assessments were made both prior to the construction of the tunnel and subsequently.

* Acid mine drainage, an ecological problem concerning very acidic water resulting from mining

World Heritage Site-status would limit mining activity in areas of ecological importance, affecting employment and government revenues.

A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater, stormwater runoff, or sewage treatment, for land reclamation after mining, refineries, or other ecological disturbances such as required mitigation for natural wetlands lost to a development.

The mining of tantalite causes many ecological and social problems in Democratic Republic of Congo.

The habitat destruction of large areas of Pinyon woodlands in the interests of mining and cattle ranching is seen by many as an act of major ecological and cultural vandalism.

The group has been very active on mining issues, transport, ecological waste management, clean air and clean water advocacy, genetic engineering, sustainable agriculture and other issues.

The mining company has also established an " ecological park ", which is basically a sanctuary for more than hundred species of mammals, birds and reptiles.

Her documentary film Niyamgiri, You are still alive, on the ecological and human damage done by bauxite mining, won a first prize in the Short Film, Environment category at the 2010 International Film Festival of India.

The region and adjacent areas were being extensively used for mining, timber extraction, and fur trapping leading to roads, clear cuts and ecological degradation.

Other than agriculture and tourism, the main economic activity in this vast and sparsely settled area is mining.

Its climate encourages outdoor recreation and tourism, though its economic mainstay has long been resource extraction, principally logging and mining.

Botswana's impressive economic record has been built on a foundation of diamond mining, prudent fiscal policies, international financial and technical assistance, and a cautious foreign policy.

Apart from fishing and agriculture, the main economic resource of the Dumnonii was tin mining.

In April 1983, in coordination with the IMF, the PNDC launched an economic recovery program, perhaps the most stringent and consistent of its day in Africa, aimed at reopening infrastructural bottlenecks and reviving moribund productive sectors — agriculture, mining, and timber.

Revenue from bauxite mining is expected to fall significantly in 2010 due mainly to the world economic situation.

In the latter part of the century, economic activity quickened with the development of large-scale, precious metal mining.

Other beneficial economic effects were few, however, because the mining industry was never well integrated into the rest of the Honduran economy.

The PDPA invited the Soviet Union to assist in modernizing its economic infrastructure ( predominantly its exploration and mining of rare minerals and natural gas ).

The tertiary sector of the economy ( also known as the service sector or the service industry ) is one of the three economic sectors, the others being the secondary sector ( approximately the same as manufacturing ) and the primary sector ( agriculture, fishing, and extraction such as mining ).

Since a productive period in the 1970s, the mining industry has been hampered by the Iran – Iraq War ( 1980 – 88 ), the sanctions of the 1990s, and the economic collapse of 2003.

The Industrial Revolution was a period from 1750 to 1850 where changes in agriculture, manufacturing, mining, transportation, and technology had a profound effect on the social, economic and cultural conditions of the times.

Until recently, the consensus has been that economic mining of the ocean depths might be decades away.

Although his nationalization of the copper mining industry in the late 1960s and the volatility of international copper prices contributed to increased economic problems, matters were aggravated by his logistical support for the black nationalist movements in Ian Smith's Rhodesian Republic, South West Africa, Angola, and Mozambique.

The global economic crisis hit the Lesotho economy hard through loss of textile exports and jobs in the sector due largely to the economic slowdown in the United States which is a major export destination, reduced diamond mining and exports, including weak prices for diamonds ; drop in SACU revenues due to the economic slowdown in the South African economy, and reduction in worker remittances due to weakening of the South African economy and contraction of the mining sector and related job losses in South Africa.

The materials of economic interest ( aka as ore ) recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock salt and potash.

An influx of immigrants following the conclusion of the war was followed by a surge in economic activity as a result of several mining booms in the late 20th and early 21st centuries, with Perth becoming the regional headquarters for a number of mining operations located around the state.

The second phase, which is slated to begin in mid-to-late 2011, will see the construction of factories in specially designated economic zones for the fishing, agriculture, livestock and mining industries.