The elephant death toll reached 90 more than a week ago, but authorities found a dozen more carcasses at a site some 38 kilometres from the main camp in the sprawling Hwange National Park, over the weekend.
The authorities suspect the mass poisoning was conducted by a second poaching ring, officials with the wildlife authorities said on Tuesday.
So far, 13 elephant tusks have been recovered and two suspects - both impoverished villagers - were arrested, the officials said.
While in the past poachers used rifles to down the jumbos to hack off their tusks, more cases of poisoning have emerged, in which poachers dose deadly cyanide in the watering holes, where thirsty elephants commonly drink water during the dry season running from May to November.
Conservationists say this kind of poaching is "cruel" as it kills not just elephants but animals in the entire food chain. In the latest poisoning case, eight vultures - the first predators at the kill - were also found to be poisoned to death.
Three of the poachers, who conducted the poisoning, had been sentenced to 16-years in prison but the mastermind of the poaching syndicate - believed to be a South African businessman - remains on the run.
Zimbabwe is home to about 120,000 African elephants, and 40 percent of them live in Hwange, the third largest national park in Africa.
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