Yep, miner bees! They're mostly in the genus Andrena. Very docile, and even if they do sting (which they rarely do), it hurts far less than a honeybee. They'll be around for a few weeks, pollinating plants and stowing away pollen and nectar for their babies. Then the adults will die off for the year, leaving their larvae in nests belowground to mature until this time next year when they'll emerge as adults. Very sweet, cool critters. Enjoy!