Question: Where is the 19th-century gold rush town 30 km north a town in the broad fertile Cudgegong River valley 261 km north-west of Sydney?

Context paragraphs:
Canadian Lead, New South Wales: Canadian Lead is a 19th-century gold rush town in rural New South Wales, Australia.  It is 301 km to Sydney.

Szamotuły County: Szamotuły County (Polish: "powiat szamotulski" ) is a unit of territorial administration and local government (powiat) in Greater Poland Voivodeship, west-central Poland.  It came into existence on January 1, 1999, as a result of the Polish local government reforms passed in 1998.  Its administrative seat and largest town is Szamotuły, which lies 32 km north-west of the regional capital Poznań.  The county contains four other towns: Wronki, 18 km north-west of Szamotuły, Pniewy, 24 km south-west of Szamotuły, Obrzycko, 13 km north of Szamotuły, and Ostroróg, 9 km north-west of Szamotuły.

Gulgong: Gulgong is a 19th-century gold rush town in the Central Tablelands and the wider Central West regions of the Australian state of New South Wales.  The town is situated within the Mid-Western Regional Council local government area.  It is located about 300 km north west of Sydney, and about 30 km north of Mudgee along the Castlereagh Highway.  At the 2016 Census, Gulgong had a population of 2,521.

Mudgee: Mudgee is a town in the Central West of New South Wales, Australia.  It is in the broad fertile Cudgegong River valley 261 km north-west of Sydney.  Mudgee is at the centre of the Mid-Western Regional Council local government area.  At the 2016 census , Mudgee had a population of 10,923 people.

Shahrinaw District: Shahrinaw District or Nohiyai Shahrinaw (Tajik: Ноҳияи Шаҳринав ; Russian spelling; Shakhrinav) is a district belonging to the Districts of Republican Subordination in Tajikistan, lying between Tajikistan's capital Dushanbe and Uzbekistan.  The Shahrinaw District borders on Tursunzoda District in the west, Hisor District in the east, and Rudaki District in the south.  It is delimited by the Gissar Range in the north and is part of the fertile Gissar Valley.  Its capital is Shahrinaw (Shakhrinav), a town 30 km west of Dushanbe.

North Columbia, California: North Columbia was a California Gold Rush town on the San Juan Ridge in Nevada County, California.  Originally known as Columbia, Columbia Hill, or The Hill because of its proximity to Columbia Hill, it started as a gold miners' camp around 1851.  When a Post Office was established on May 29, 1860, the word "North" was added in order to differentiate the settlement from Columbia, California, another gold rush town in Tuolumne County, California.

Lapland gold rush: The Lapland gold rush, also known as the Ivalo Gold Rush, was a gold rush that occurred in Lapland, Grand Duchy of Finland, during the 1870s.  The Lapland gold rush started in the valley of the Ivalojoki river in 1870 and lasted for a few years.  Although the scale of the Lapland gold rush is not comparable to the major 19th century gold rushes, the Lapland gold rush has great local significance in Lapland and across Finland.

Błędowo, Ostrołęka County: Błędowo is a village in the administrative district of Gmina Baranowo, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.  It lies approximately 9 km north-west of Baranowo, 30 km north-west of Ostrołęka, and 114 km north of Warsaw.

Ruda, Wołomin County: Ruda is a village in the administrative district of Gmina Radzymin, within Wołomin County, Masovian Voivodeship, in east-central Poland.  It lies approximately 6 km north-west of Radzymin, 15 km north-west of Wołomin, and 30 km north of Warsaw.

Home Rule, New South Wales: Home Rule is a 19th-century gold rush town in rural New South Wales, Australia.  It is 290 km to Sydney.

Supporting paragraphs: Gulgong Mudgee
Answer: Central Tablelands