{
  "copper_region_system": {
    "resource_type": "copper_ore",
    "description": "Copper feature selection based on region mass and biome compatibility",

    "features": {
      "porphyry_copper": {
        "display_name": "Porphyry Copper",
        "incompatible_biomes": ["wetlands", "coastal_plain"],
        "frequent_biomes": ["hills", "rocky_plateau", "alpine"],
        "minimum_region_mass": 200,
        "quality_base": "premium",
        "extraction_difficulty": "hard",
        "budget_impact": 5,
        "description": "Large-scale copper system requiring massive geological activity"
      },

      "copper_vein": {
        "display_name": "Copper Vein",
        "incompatible_biomes": ["wetlands"],
        "frequent_biomes": ["hills", "rocky_plateau", "alpine"],
        "minimum_region_mass": 75,
        "quality_base": "premium",
        "extraction_difficulty": "medium",
        "budget_impact": 4,
        "description": "High-grade copper veins in medium-strength regions"
      },

      "chalcopyrite_deposit": {
        "display_name": "Chalcopyrite Deposit",
        "incompatible_biomes": ["wetlands", "tropical_rainforest"],
        "frequent_biomes": ["hills", "temperate_forest", "grassland", "scrubland"],
        "minimum_region_mass": 50,
        "quality_base": "standard",
        "extraction_difficulty": "medium",
        "budget_impact": 3,
        "description": "Standard copper sulfide in moderate regions"
      },

      "malachite_outcrop": {
        "display_name": "Malachite Outcrop",
        "incompatible_biomes": ["wetlands", "tropical_rainforest"],
        "frequent_biomes": ["hills", "scrubland", "grassland"],
        "minimum_region_mass": 30,
        "quality_base": "standard",
        "extraction_difficulty": "easy",
        "budget_impact": 2,
        "description": "Surface copper ore in small to medium regions"
      },

      "native_copper": {
        "display_name": "Native Copper",
        "incompatible_biomes": ["wetlands", "tropical_rainforest", "hot_desert"],
        "frequent_biomes": ["rocky_plateau", "hills", "alpine"],
        "minimum_region_mass": 100,
        "quality_base": "premium",
        "extraction_difficulty": "easy",
        "budget_impact": 3,
        "description": "Pure copper requiring specific geological conditions"
      },

      "copper_shale": {
        "display_name": "Copper Shale",
        "incompatible_biomes": ["wetlands", "alpine", "rocky_plateau"],
        "frequent_biomes": ["grassland", "temperate_forest", "scrubland"],
        "minimum_region_mass": 150,
        "quality_base": "low",
        "extraction_difficulty": "very_hard",
        "budget_impact": 2,
        "description": "Low-grade copper in large sedimentary regions"
      }
    },

    "selection_logic": {
      "step_1": "Check region mass against minimum_region_mass",
      "step_2": "Filter out features with incompatible biomes",
      "step_3": "Prioritize features with frequent biomes for this location",
      "step_4": "Select from available features",
      "fallback": "If no features available, place generic copper_ore"
    },

    "mass_categories": {
      "small_region": {"mass_range": [30, 75], "typical_features": ["malachite_outcrop", "chalcopyrite_deposit"]},
      "medium_region": {"mass_range": [75, 150], "typical_features": ["copper_vein", "chalcopyrite_deposit"]},
      "large_region": {"mass_range": [150, 300], "typical_features": ["porphyry_copper", "copper_shale", "native_copper"]},
      "huge_region": {"mass_range": [300, 1000], "typical_features": ["porphyry_copper", "copper_shale"]}
    }
  }
}