Here are some interesting links to info about this phenomena!
Background
Fat Possum Opens Its Own Vinyl Pressing Plant
Digital Media News: 2014 Vinyl Sales Up 38%
Things You Should Know Before Starting A Vinyl Collection
German Police Bust ‘Europe’s Largest’ Underground Pressing Plant
Facilities
Welcome to 1979: Masters of Their Domain
Mastering Lab: Vinyl Mastering
The Vinyl Factory: How To Master A Record
Air Studios Mastering… be sure to download their Vinyl App!
Jack White’s Third Man Records…fastest record ‘record’
United Recording Pressing…the largest pressing plant in the US!
Musicol…Columbus’ Oldest Recording Studio and Vinyl Pressing Plant