Block from U+1C50 to U+1C7F. This block was introduced in Unicode version 5.1 (2008). It contains 48 codepoints.
The Wikipedia provides the following information on block Ol Chiki:
Ol Chik is a Unicode block containing characters of the Ol Chiki, or Ol Cemet' script used for writing the Santali language during the early 20th century.