Margaret Thatcher described "the miners" as "basically reasonable people" and doubted whether they would "follow" National Union of Mineworkers' leader Arthur Scargill "in trying to have a row" with the government, her 1981 private papers reveal.
The Prime Minister made the comments in an "off the record" interview with Sunday Express journalists in December 1981, less than three years before Scargill led miners in a strike which socialist historians say resulted in the "most important defeat for the trade union movement" in more than half a century, files show.
Interview notes record how Thatcher asked whether she sounded "too patronising" when describing her feelings about "the miners".
She is noted as saying: "I have a lot of faith in the miners let me say. They know. They know where the extra money comes from. And I think they are basically reasonable people. That sounds too patronising?"
"They will think about their neighbours. I really do believe that, genuinely. Don't put this down. My feeling about it was always that they will vote for Scargill because they recognise a very skilful and good negotiator. But I don't think they would follow him in trying to have a row with government. I really don't.
"I don't think they will follow him on the political motivation."
An online Trades Union Congress history of the 1984 strike says the Conservative Government used its "limitless resources" to defeat strikers.
"The Conservative government's long-term agenda, the privatisation of the energy sector, required a restructuring of the coal industry. An attempt at large-scale closures in 1981 was dropped when unofficial strikes spread rapidly and government ministers found themselves unprepared to fight at the time. This situation had changed by 1984," it says.
"In March 1984, when five pits were announced for closure without proper review, official area strikes started in Yorkshire and Scotland. These were endorsed by the NUM executive which called on other areas to support them.
"It believed that there was a large hit list of vulnerable pits and that a stand had to be taken before the heart was ripped out of the industry and coal communities were shattered.
"The Government used its limitless resources (particularly the deployment of police on a national stage) to defeat the miners."
The history adds: "Played out nightly on television screens for the rest of the nation, it became a titanic struggle lasting until March 1985 when, by the tiniest margin, a majority of conference delegates voted to return without a new agreement on managing closures in order to control the unorganised drift back to work and to salvage the union.
"During the strike 11,291 people were arrested, of whom 8,392 were charged, mainly for breach of the peace, obstructing the police and obstructing the highway.
"This was without doubt the most important defeat for the trade union movement since the collapse of the General Strike in 1926."