On one occasion, a member of the gang was found in possession of 5kg of heroin after delivering the cash in a crane.
Kerry Evans, 35, was the 'orchestrator' of the enterprise which involved huge amounts of money involved.
Speaking at a sentencing hearing at Cardiff Crown Court, prosecutor Andrew Jones said: "It involved various people in different roles, at different points of time and geographic locations, who came together to engage in drug dealing on a colossal scale and vast amounts of money."
There was a widespread distribution network between the north of England and Merthyr Tydfil.
During the course of an investigation by regional organised crime unit Tarian, almost 10kg of cocaine and 5kg of heroin were seized with a potential street value of in excess of £1.5m.
Over the course of 12 months, Evans boasted he was involved in the sale of 600kg of either heroin, cocaine, or a combination of the both.
An estimated wholesale valued of this amount was value between £13.8m and £19.2m. If broken down into street deals, the estimated value of the drugs was between £64m and £72m.
Evans was described as a 'regional manager' and was 'at the very top of the hierarchy' in the gang. He was the 'focal point' of contact of many of the drug deals and was in contact with the majority of the defendants.
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
NEXT STOP... FIVE CLUBS FOR RASH
MARCUS Rashford has admitted he is ready to leave United.
Manager reveals Garna is 'upset' over derby snub
RUBEN Amorim has revealed Alejandro Garnacho is ‘a little bit upset with him’ over his omission from the United squad against City on Sunday.
Amorim: Rash should have told me privately he wanted to leave
UNITED head coach Ruben Amorim has told Marcus Rashford he should have told him privately that he wanted to leave the club.
'There is nothing to celebrate when United cash in on a hitherto one-club man, but they have to
LITTLE that Dan Ashworth said or did has aged well at United but one quote endures.
Erl looks stronger than ever regardless of City's struggles
IN another season, the City medical team would be giving themselves a pat on the back.
Say what you like about Walker but he always fronts up despite poor results
KYLE Walker deserves plenty of criticism for his form this season but some of it has been over the top.
CITY'S TEST AT VILLA IS HUGE
CITY players will have returned to training yesterday with both hope and dread.
Reds boss should look to the Etihad to see how to deal with wantaways...
UNITED should be riding high after their derby win at the Etihad Stadium.
Keely is the 'real deal' - Lord Coe
WORLD Athletics president Lord Coe is convinced “real deal” and newly-crowned BBC Sports Personality of the Year Keely Hodgkinson has already ascended to British great status.
Roots of our festive traditions
BRINGING plants into the house to celebrate the festive season has long been part of our Christmas tradition.