For 10 points, name this resource whose workers are prone to miner's lung.
Workers of this resource engaged in the Battle of Orgreave, and the Colorado National Guard killed two dozen workers of this resource in the Ludlow massacre. The Ruhr region has traditionally worked this resource, and a series of Italian revolutionary societies named the (*) Carbonari were composed of workers in this resource. Along with steel, this resource names a precursor to the European Union, and Teddy Roosevelt helped end a 1902 strike in this resource. Children called "breaker boys" were frequently used to gather this resource in the Industrial Revolution. For 10 points, name this resource whose workers are prone to miner's lung.
Workers of this resource engaged in the Battle of Orgreave, and the Colorado National Guard killed two dozen workers of this resource in the Ludlow massacre.
coal (prompt on just “mining”; accept charcoal; accept specific varieties like anthracite and bituminous; accept word forms)