Anthracite iron Company and its first furnace at Catasauqua, which went into blast in 1840, along with five other anthracite furnaces. This marked the commercial establishment of anthracite iron production in the United States. The opening of bituminous coal deposits suitable for coking in the western part of the Allegheny Plateau resulted in the gradual displacement of anthracite as a fuel. The production of coke-fired furnaces overtook that of anthracite-fired furnaces in 1875, and the last anthracite furnaces in the US, the former Lock Ridge Iron Company, converted to coke in 1914. Anthracite iron Anthracite iron or Anthracite 'Pig Iron' is the
Anthracite budgerigar mutation now be determined. It seems likely that the Anthracite is the re-emergence of the English Grey. A bird with two Anthracite factors has an extremely dark grey body, jet black markings and the cheek patches of the same very dark grey as the body. G W von Kamrath describes them as "jet black wing and tail markings and deep black cheek patches". A single Anthracite factor has a similar effect to the Dark mutation, causing a Skyblue to become Cobalt in appearance. The Anthracite mutation appeared in Germany in 1998 in the aviaries of Hans-Jürgen H Lenk, who successfully established