The council's chief economist Henk Langenhoven put the case to the National Energy Regulator of South Africa on Friday as it considered Eskom's application for a further R27.3 billion (US$1.8 billion) in revenue.
"The Minerals Council's economic modelling suggests that the granting of Eskom's application will result in more than 8,200 job losses at marginal mining operations," Langenhoven said.
"There would doubtless be equivalent impacts elsewhere in the economy. All of this could have been prevented had Eskom been run efficiently."
Miners were disrupted by unprecedented power problems in December, capping off a year of supply issues.
"Due to 30 days' loadshedding by Eksom in 2019, the mining industry lost between R7 billion and R12 billion in production," Langenhoven said.
The mining lobby group said tariff increases of more than 523% since 2008 were largely responsible for the decline in electricity sales volumes.
Repeated calls for action
The minerals council has reiterated its calls for action to address the country's power, economic and crime crisis.
It was encouraged by comments from president Cyril Ramaphosa at his state of the nation address earlier this month but said on Friday measures needed to be included in this Wednesday's budget, to be presented by finance minister Tito Mboweni.
Minerals council CEO Roger Baxter said the budget should signal a number of measures, to implement the Treasury Strategy to boost the economy, address the country's fiscal and electricity crisis, become tax competitive, boost business and investor confidence, address crime affecting business and encourage a greenfields exploration boom.