Most new projects launch as PoS tokens, so truly mineable PoW coins are rare. Mining is dominated by major networks, making fresh PoW launches uncommon. To spot the few that do appear:

ASIC Miner Value (asicminervalue.com) for ASIC‐profitable coins and earnings.

CoinGecko / CoinMarketCap: filter by “Mineable” and sort by “Recently Added.”

Launchpads & developer forums for small teams’ announcements.