History of anthracite coal mining in Pennsylvania increasing production levels but an overall trend of falling prices. In 1830 anthracite coal was selling for $11 per ton, in 1840 it was $7 per ton, and by 1860 it was $5.50 a ton in NYC, while total production was increasing (Adams, “US Coal Industry”). This was due in part to a general anti-charter sentiment towards the coal industry by the Pennsylvania state government, making it difficult for coal corporations to receive charters (Adams, “Different Charters”), as well as a seasonal market that experienced fluctuation in demand for anthracite (Dublin, Licht, 17). The onset of the war brought an
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