{
  "coal_resources": {
    "rich_coal_seam": {
      "display_name": "Rich Coal Seam",
      "description": "High-quality coal deposit with excellent heating value and low impurities",
      "formation_type": "compressed_carboniferous_forest",
      "extraction_difficulty": "medium",
      "budget_impact": 4,
      "resource_yield": "high",
      "quality": "premium"
    },
    "coal_seam": {
      "display_name": "Coal Seam",
      "description": "Standard coal deposit suitable for industrial and heating applications",
      "formation_type": "compressed_carboniferous_forest",
      "extraction_difficulty": "medium",
      "budget_impact": 3,
      "resource_yield": "medium",
      "quality": "standard"
    },
    "coal_outcrop": {
      "display_name": "Coal Outcrop",
      "description": "Surface-exposed coal formation easy to access but lower quality",
      "formation_type": "exposed_carboniferous_forest",
      "extraction_difficulty": "easy",
      "budget_impact": 2,
      "resource_yield": "medium",
      "quality": "standard"
    },
    "surface_coal": {
      "display_name": "Surface Coal",
      "description": "Weathered coal deposits scattered on surface with minimal extraction requirements",
      "formation_type": "eroded_coal_seam",
      "extraction_difficulty": "very_easy",
      "budget_impact": 1,
      "resource_yield": "low",
      "quality": "low"
    },
    "peat_bog": {
      "display_name": "Peat Bog",
      "description": "Early-stage coal formation providing low-grade fuel and soil amendment",
      "formation_type": "partially_decomposed_organic_matter",
      "extraction_difficulty": "easy",
      "budget_impact": 1,
      "resource_yield": "low",
      "quality": "low"
    },
    "lignite_deposit": {
      "display_name": "Lignite Deposit",
      "description": "Brown coal with moderate heating value, intermediate between peat and bituminous coal",
      "formation_type": "intermediate_carboniferous_compression",
      "extraction_difficulty": "medium",
      "budget_impact": 2,
      "resource_yield": "medium",
      "quality": "medium"
    }
  }
}