The corpses of the seven men, 32 women and 48 children were in addition to five bodies of women and girls found earlier, a security source said yesterday.
All died in early October after a failed attempt to reach Algeria that began in late September, the source added.
Almoustapha Alhacen, from local aid organisation Aghir In'man, confirmed the death toll and gave a graphic account of discovering the bodies.
"The corpses were decomposed; it was horrible," he said.
Nigerien officials said on Monday that dozens of migrants, most of them women and children, had died of thirst in the Sahara desert earlier this month.
Rhissa Feltou, the mayor of the main northern town of Agadez, told AFP that two vehicles were carrying the migrants when one broke down, and they were all left behind in the desert while the remaining vehicle was driven off.
Nineteen others reached the Algerian city of Tamanrasset but were sent back to Niger, the source added.
Niger is one of the world's poorest countries and has been hit by successive food crises.
Libya, rather than Algeria, is more frequently the favoured country of transit for west Africans making the journey across the continent, many of whom aim to travel on to Europe.
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