Mining Rights Token

interface MiningRightsMetadata {
  licenseNumber:       string;
  mineralType:         string;  // Gold | Coltan | Copper | Diamond | Coal | Lithium
  concessionArea:      string;  // Area description or GPS polygon
  areaHectares:        bigint;
  licenseExpiry:       bigint;  // Unix timestamp
  issuingAuthority:    string;  // e.g. "Ministry of Mines, DRC"
  licenseDocumentHash: string;  // bytes32 — IPFS hash
  royaltyRateBps:      bigint;  // e.g. 300 = 3% royalty on extraction
  lastUpdated:         bigint;
}

const now      = BigInt(Math.floor(Date.now() / 1000));
const twoYears = BigInt(2 * 365 * 24 * 60 * 60);

const result = await factory.deployMiningRights({
  name:        "Kibali Gold Concession",
  symbol:      "KGOLD",
  assetId:     "MINE-DRC-GOLD-001",
  countryCode: "CD",
  metadata: {
    licenseNumber:       "DRC-MIN-2025-001",
    mineralType:         "Gold",
    concessionArea:      "Block 7, Ituri Province",
    areaHectares:        BigInt(1200),
    licenseExpiry:       now + twoYears,
    issuingAuthority:    "Ministry of Mines, Democratic Republic of Congo",
    licenseDocumentHash: ethers.ZeroHash,
    royaltyRateBps:      BigInt(350),  // 3.5%
    lastUpdated:         now,
  },
});

Transfer(address indexed from, address indexed to, uint256 value)
MetadataUpdated(uint256 indexed version, uint256 timestamp)
RoyaltyDeclared(
  uint256 extractionValueUSD,
  uint256 royaltyAmountUSD,
  uint256 perTokenUSD,
  uint256 timestamp
)