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Alpha miner was the first process discovery algorithm ever proposed, and it gives a good overview of the aim of process discovery and how various activities within the process are executed. Alpha miner was also the basis for the development of many other process mining techniques such as heuristic miner , genetic mining was developed based on ...
Alpha Metallurgical Resources, formerly Contura Energy (January 2021), is a leading coal supplier with underground and surface coal mining complexes across Northern and Central Appalachia. Contura owns large coal basins in Pennsylvania, Virginia and West Virginia which supply both metallurgical coal to produce steel and thermal coal to generate ...
Alpha secured $3.3 billion in financing for the takeover from Citigroup and JPMorgan Chase. [10] The combined entity will be the world's number three producer of metallurgical coal, behind BHP and Teck Resources. [13] Alpha settled Massey's Upper Big Branch Mine disaster liabilities with the U.S. Attorney for $209 million on December 6, 2011.
Personal protective equipment lessens this risk, but maintaining adequate protection is not easy, especially as advancing mining technologies have made mechanized fracturing of the rock and coal more efficient on a per-worker basis, making more dust to control in tighter spaces and time frames.
Added data up to 30 September 2021. Changed Y axis labels to powers of 10. 10:02, 1 November 2019: 567 × 319 (22 KB) Ladislav Mecir: Adjust maximum of the horizontal axis, add data up to 29 October 2019. 16:44, 15 October 2019: 567 × 319 (22 KB) Ladislav Mecir: Add data up to 1 October 2019: 23:24, 2 January 2017: 567 × 319 (22 KB) Ladislav ...
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[2] [3] It is an isolated railroad, not connected to the North American railroad network. [4] Rolling stock was delivered by the Norfolk Southern to a siding in Poland Mines, and then taken by truck and trailer to the railroad's dockside terminus near Masontown. One EMD SD-40 and two SD38-2 locomotives comprise the power roster.
The parameter is dependent on a maximum of three discontinuity sets that determine the size and the form of the rock blocks. The condition parameter is determined by the discontinuity set with the most adverse influence on the stability. The concept of adjustment factors for the rock mass before and after excavation is very attractive. [4]