The National Union of Mineworkers (NUM) has accused management at Anglo Platinum of insulting its members after offering workers a 6.75 percent wage increase.

NUM has declared a wage dispute with the top platinum producer after negotiations deadlocked.

The union is demanding a wage hike of 14.5 percent.

NUM, whose members make up a fifth of the workforce at Amplats, had originally sought a 20 percent wage increase but brought it down to 14.5 percent.

Anglo American Platinum’s Mpumi Sithole says they are still negotiating with the union and are hopeful that both parties will come to an agreement soon.

“We remain optimistic that we will reach an agreement.”

But the NUM’s Livhuwani Mammburu says the 6.75 percent increase currently on the table is insulting.

“Our members feel that they cannot accept this insulting offer.”

Amplats, which is in the process of selling its labour-intensive Rustenburg mines to Sibanye Resources, is also in wage talks with its majority union Amcu which lead a crippling five-month long strike against the sector in 2014.