Underground mining was described in this account, although it cannot be determined when it had started.

Schematic of a Underground mining ( hard rock ) | cut and fill mining operation in hard rock.

Underground longwall mining.

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds.

Category: Underground mining

Underground coal mining commenced around 1899 by the Seattle and San Francisco Railway and Navigation Company, although coal had been mined in nearby Danville and Landsburg a few years earlier.

* NORCAT's Underground Mine Centre ( Fecunis Adit ), used for underground training and mining technology development in Onaping, ON, Canada

Category: Underground mining

* Underground mining equipment

Underground coal mining brings with it the problem of subsidence.

Underground mining ceased in Snailbeach in 1955.

Underground mining began with the Day Dawn mine in 1931 ; a number of similar operations were opened before and after the Second World War.

Underground mining methods are used for the Korobkovskoye deposit.

Now it is mainly a tourist destination and home to the Kimberley Alpine Resort, a ski area and the Kimberley Underground Mining Railway that features a underground mining interpretive centre.

Category: Underground mining

Underground mining in the area was begun in 1890, and Daniel C. Jackling and Robert C. Gemmell, both engineers, examined Wall's properties and recommended open-pit mining.

Category: Underground mining

Underground mining developed in the 19th Century, but the stone trade declined in the 20th Century stopping in the 1960s.

Category: Underground mining

* Underground mining ( hard rock )

* Underground mining ( hard rock )

After its initial success, he continued to design the Underground map until 1960, a single ( and unpopular ) 1939 edition by Hans Scheger being the exception.

Garbutt continued to produce Underground maps for at least another twenty years — Tube maps stopped bearing the designer's name in 1986, by which time the elements of the map bore a very strong resemblance to today's map.

The Poles did not surrender ; they established a Polish Underground State and an underground Home Army, and continued to fight with the Allies on all fronts outside Poland.

He continued to record a number of well-reviewed studio albums, particularly Criss Cross, also from 1963, and Underground, from 1968.

Leavitt's descendants continued to remain in Charlemont and the surrounding region, and several — including Col. Roger Hooker Leavitt, who represented Charlemont in the Massachusetts House of Representatives, and his brother Hart Leavitt -- became notable operators of stations on the Underground Railroad, sheltering many escaped slaves on their journeys northward.

In 1970, the Weather Underground planned to detonate a nail bomb at a noncommissioned officers dance at the base to " bring the war home " and " give the United States and the rest of the world a sense that this country was going to be completely unlivable if the United States continued in Vietnam.

Underground testing of weapons continued until 23 September 1992, and although the United States did not ratify the Comprehensive Test Ban Treaty, the articles of the treaty are nevertheless honored and further tests have not occurred.

However, she continued to produce stories, including Je ne parle pas français, one of her darker works ( believed to have been inspired by Fyodor Dostoevsky's Notes from the Underground, it is a deeply personal work that casts Murry in negative light ).

They both continued their success in the Global Underground series with Digweed's GU 014: Hong Kong and Sasha's GU 013: Ibiza.

Underground tests in the United States continued until 1992 ( its last nuclear testing ), the Soviet Union in 1990, the United Kingdom in 1991, and both China and France in 1996.

With the promise of continued services, the government finally agreed to London Underground closing the line.

Although the rest of the branch was electrified by London Underground before operations were taken over from British Railways, trains on the section north of Epping continued to be hauled by steam locomotives as a separate shuttle service.

He and manager Ken Adam opened " Bestie's Beach Club " ( now called " The Underground " after the London subway system ) in Hermosa Beach, California in the 1970s, and continued to operate it until the 1990s.

The Power Cavern ( life support for the Underground Complex ) has continued to provide heat, ventilation, air conditioning and other utility operations to prevent the complex from falling into decay.

Between the early 1930s and 2003 the system was officially known as the " Glasgow Underground ", but many citizens always continued referring to it as the " Subway ".

He continued to be active in the Underground Railroad, setting up a new safe house in the city and helping organize a larger network in the area.

Throughout the 1980s and into the early 1990s, both underground and professional races continued to be held in Southern California by such organizations as the Underground Racers Association ( URA ), Federation of International Gravity Racing ( FIGR ) and Road Racers Association for International Luge ( RAIL ).

Key Underground ( community ) bands of the time who often performed at benefit gigs for various worthy causes included Pink Floyd ( when they still had Syd Barrett ), Soft Machine, Hawkwind, The Deviants ( featuring Mick Farren ), and Pink Fairies ; other key people included, in the late ' 60s, Marc Bolan, who would leave " the Grove " to find fame with T Rex and his partner Steve Peregrin Took, who remained in Ladbroke Grove and continued to perform benefit gigs in the anti-commercial ethos of the UK underground.

In early July 1944, even as the AK resistance continued its struggle against the Germans, the Underground State was forced to order the AK and its administrative structure to remain in hiding from the Soviets, due to continued arrests and reprisals experienced by those who revealed themselves.

He became an accountant after the German invasion of Poland but continued working in the Underground Warsaw University.

Although Uxbridge Road station and its branch were closed in 1940, they continued to appear on the Underground map until 1947.

Despite closer co-operation and improvements made to the CLR stations and to other parts of the network, the Underground railways continued to struggle financially.

Steam locomotives continued to be used on Underground engineering trains on some surface sections of the Metropolitan Line until 1971, several years after steam had been phased out on the BR network.