"A farmer, digging his cellar, almost two meters below ground level, struck the massive lower jaw of a mammoth with his spade. The jawbone was upside down, and had been inserted into the bottom of another jaw like a child's building brick. In fact, as subsequent excavation showed, a complete ring of these inverted interlocking jaws formed the solid base of a roughly circular hut four or five meters across. About three dozen huge, curving mammoth tusks had been used as arching supports for the roof and for the porch, some of them still left in their sockets in the skulls. Separate lengths of tusks were even linked in laces by a hollow sleeve of ivory that fitted over the join. It has been stimated that the total of bones incorporated in the structure must have belonged to a minimum of ninety-five mammoths. This need ,not be a measure of some prodigious hunting feat, since gnawing marks of carnivores suggest that many of them were scavenged. However, the task of dragging the enormous skulls across country should not be underestimated since a-small one weighed about one hundred kilograms." link
Like the article says, they didn't necessarily hunt and kill all the mammoths used to create the structure, but they have found many of these sites in Russia, the Ukraine and Poland, so this isn't some rare anomaly. It's difficult to believe that these structures were all constructed by tidy humans policing up mammoth litter.
They've also found numerous "butcher sites" in the U.S. consisting of mammoth bones with cut marks, and stone artifacts. Maybe these were just examples where humans found a dead or dying mammoth and they took advantage of an opportunity, but I don't see why it would be beyond their abilities to spear a mammoth with a 6-inch long Clovis point and then follow it for a few days until it dropped. After all, thousands of pounds of meat could be gained with a fairly low risk.
The reason I don't believe humans are responsible for causing the extinction of the mammoth is because dozens of other species went extinct around the same time.
Not clear how many mammoths in a herd - but the math of female maturity & reproduction vs. hunting and climate should be considered also.
A female mammoth reaches maturity at 15 with a gestation period of 22 months. Not clear on life expectancy - but if hunters killed off pregnant females (or in estrus) and/or their young...that could have caused a severe repopulation problem.