The Johannesburg-listed miner, one of the world's largest platinum producers, said headline earnings per share (HEPS) for the six months to June 30 fell to 26.27 rand per share compared with 28.15 rand a year earlier.
HEPS is the main profit measure used in South Africa that strips out certain once-off items.
Earnings before interest, taxes, depreciation, and amortization (EBITDA) rose to 13.1 billion rand (618.26 million pounds) from 12.4 billion rand in the year ago period, driven by higher metals prices.
The precious metals producer said it expected output to improve in the second half of the year despite production of platinum group metals (PGM) down 25% year-on-year to 1.6 million ounces due to shutdowns in South Africa and Zimbabwe.
"We expect to see a stronger production performance in H2 2020, but caution that significant headwinds still exist," said Amplats CEO Natascha Viljoen.
Viljoen, who was appointed CEO in April, said output capacity levels were around 80% by the end of June and expected it to increase to above 95% by the end of the year boosted by open-pit and mechanised mines.
"We expect a recovery in 2021, though ongoing social-distancing measures and the possibility of further COVID-19-related shutdowns means output is unlikely to return to its previous level, particularly from underground operations," the company said.
Mining companies in South Africa are anxious about managing COVID-19 and preventing outbreaks at mine sites where workers are in close quarters and confined spaces.
(Reporting by Tanisha Heiberg; Editing by Alex Richardson and Emelia Sithole-Matarise)