Best UK Casinos to Play Diamond Mine
Every casino listed here holds a valid UKGC licence, has been tested with a real account, and has been confirmed to carry Diamond Mine Megaways at the correct 96.43% RTP setting. Some operators — including PlayOJO — run the game at a reduced 94.50% configuration, which directly affects your expected return on every session. Casinos running reduced RTP versions are not included in this list.
Ratings are built across five criteria and combined into a score out of 10. A large welcome bonus does not compensate for slow withdrawals or opaque wagering terms — all five categories carry weight, and casinos are ranked on combined performance rather than headline figures alone. Since January 2026, all UKGC-licensed operators are capped at a maximum 10x wagering requirement on all bonus funds.
Diamond Mine Megaways — Slot at a Glance
Diamond Mine Megaways was developed by Blueprint Gaming and released on 1 May 2018 as the studio’s first ever Megaways title — built as a direct tribute to Big Time Gaming’s Bonanza, the original Megaways slot. The game runs on a 6-reel grid with a variable number of rows per reel (2–7) plus a horizontal reel above reels 2–5, producing up to 117,649 ways to win on any single spin. Every winning combination triggers a cascade reaction: matched symbols explode and new ones drop from above, with the process repeating until no new wins form. The Wild West mining theme runs throughout — banjo soundtrack, desert backdrop, TNT mystery symbols, and a bearded prospector as the lead character.
| Detail | Value |
| Developer | Blueprint Gaming |
| Release Date | 1 May 2018 |
| Grid | 6 reels × 2–7 rows + horizontal reel (reels 2–5) |
| Ways to Win | Up to 117,649 |
| RTP | 96.43% (standard) — may vary per operator |
| Volatility | High |
| Max Win | 10,000x stake (£250,000 cap at some operators) |
| Min Bet | £0.20 |
| Max Bet | £100 |
| Key Features | Megaways, Cascading Reels, TNT Mystery Symbols, Wild (horizontal reel), Free Spins with unlimited win multiplier |
| Free Spins trigger | 4+ scatters → 12 spins + 5 per additional scatter |
| Sequels | Diamond Mine Extra Gold Megaways · Diamond Mine 2 Megaways |
| Mobile | Yes — HTML5, iOS and Android |
| Available in UK | Yes — at UKGC-licensed operators |
The Free Spins feature activates with 4 or more scatter symbols, awarding 12 base spins plus 5 for each additional scatter. During the bonus round, an unlimited win multiplier starts at 1x and rises by 1 for every cascade — there is no cap on how high it can climb. The maximum win is capped at 10,000x the stake (or £250,000 per spin at some operators). The slot has since spawned two sequels: Diamond Mine Extra Gold Megaways and Diamond Mine 2 Megaways, the latter adding a Gold Spins bonus mode with a guaranteed multiplier floor.
