diff --git a/pytchat/paramgen/arcparam_mining.py b/pytchat/paramgen/arcparam_mining.py
deleted file mode 100644
index 7e3525a..0000000
--- a/pytchat/paramgen/arcparam_mining.py
+++ /dev/null
@@ -1,133 +0,0 @@
-from base64 import urlsafe_b64encode as b64enc
-from functools import reduce
-import urllib.parse
-
-'''
-Generate continuation parameter of youtube replay chat.
-
-Author: taizan-hokuto (2019) @taizan205
-
-ver 0.0.1 2019.10.05
-'''
-
-
-def _gen_vid_long(video_id):
-    """generate video_id parameter.
-    Parameter
-    ---------
-        video_id : str
-
-    Return
-    ---------
-    byte[] : base64 encoded video_id parameter.
-    """
-    header_magic = b'\x0A\x0F\x1A\x0D\x0A'
-    header_id = video_id.encode()
-    header_sep_1 = b'\x1A\x13\xEA\xA8\xDD\xB9\x01\x0D\x0A\x0B'
-    header_terminator = b'\x20\x01'
-
-    item = [
-        header_magic,
-        _nval(len(header_id)),
-        header_id,
-        header_sep_1,
-        header_id,
-        header_terminator
-    ]
-
-    return urllib.parse.quote(
-        b64enc(reduce(lambda x, y: x + y, item)).decode()
-    ).encode()
-
-
-def _gen_vid(video_id):
-    """generate video_id parameter.
-    Parameter
-    ---------
-        video_id : str
-
-    Return
-    ---------
-        bytes : base64 encoded video_id parameter.
-    """
-    header_magic = b'\x0A\x0F\x1A\x0D\x0A'
-    header_id = video_id.encode()
-    header_terminator = b'\x20\x01'
-
-    item = [
-        header_magic,
-        _nval(len(header_id)),
-        header_id,
-        header_terminator
-    ]
-
-    return urllib.parse.quote(
-        b64enc(reduce(lambda x, y: x + y, item)).decode()
-    ).encode()
-
-
-def _nval(val):
-    """convert value to byte array"""
-    if val < 0:
-        raise ValueError
-    buf = b''
-    while val >> 7:
-        m = val & 0xFF | 0x80
-        buf += m.to_bytes(1, 'big')
-        val >>= 7
-    buf += val.to_bytes(1, 'big')
-    return buf
-
-
-def _build(video_id, seektime, topchat_only):
-    switch_01 = b'\x04' if topchat_only else b'\x01'
-    if seektime < 0:
-        raise ValueError("seektime must be greater than or equal to zero.")
-    if seektime == 0:
-        times = b''
-    else:
-        times = _nval(int(seektime * 1000))
-    if seektime > 0:
-        _len_time = b'\x5A' + (len(times) + 1).to_bytes(1, 'big') + b'\x10'
-    else:
-        _len_time = b''
-
-    header_magic = b'\xA2\x9D\xB0\xD3\x04'
-    sep_0 = b'\x1A'
-    vid = _gen_vid(video_id)
-    _tag = b'\x40\x01'
-    timestamp1 = times
-    sep_1 = b'\x60\x04\x72\x02\x08'
-    terminator = b'\x78\x01'
-
-    body = [
-        sep_0,
-        _nval(len(vid)),
-        vid,
-        _tag,
-        _len_time,
-        timestamp1,
-        sep_1,
-        switch_01,
-        terminator
-    ]
-
-    body = reduce(lambda x, y: x + y, body)
-
-    return urllib.parse.quote(
-        b64enc(header_magic + _nval(len(body)) + body
-               ).decode()
-    )
-
-
-def getparam(video_id, seektime=0.0, topchat_only=False):
-    '''
-    Parameter
-    ---------
-    seektime : int
-        unit:seconds
-        start position of fetching chat data.
-    topchat_only : bool
-        if True, fetch only 'top chat'
-    '''
-    return _build(video_id, seektime, topchat_only)