30 CFR 57.19050 - Bucket requirements.
(a) Be securely attached to a crosshead when traveling in either direction between the lower and upper crosshead parking locations;
(b) Have overhead protection when the shaft depth exceeds 50 feet;
(c) Have sufficient depth or a suitably designed platform to transport persons safely in a standing position; and
(d) Have devices to prevent accidental dumping where the bucket is supported by a bail attached to its lower half.