Pretty sure well before then as most of it was done three months ago.
Main reason is that I had something always supporting the earth be it nether rock or above a chasm nether brick. In this instance I swapped out the brick for a ring of quartz at the -100m mark. So the earth should not have been there as the supporting surface was gone.
The hoppers where connecting to a large chest and a furnace on top of it with a hopper on top of that with a feeder chest on top again within a chimney. He chimney was built last. The building, chimney, chests and furnace are still there, whilst the connecting hoppers have disappeared.
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