The excerpt you provided contains two types of figurative language:
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Metaphor: The phrase "papery brown mountain" uses metaphor by comparing the pile of leaves to a mountain, emphasizing its large size and daunting presence without using "like" or "as."
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Imagery: The description evokes sensory experiences through visual details ("papery brown") which helps the reader visualize the scene and the overwhelming task of raking leaves.
So, the correct answers are metaphor and imagery.