Golden Fibre refers to

Jute is widely recognized as the 'Golden Fibre' due to its natural golden-brown color, silky sheen, and significant economic value [t1][t2][t3]. It is a long, soft, and shiny natural vegetable fibre that can be spun into coarse, strong threads [t3]. In India, jute is the second most important cash crop after cotton and is primarily grown in well-drained fertile soils of flood plains [t1][t6]. The term 'Golden Fibre' also relates to the 'Golden Fibre Revolution,' which aims to increase jute production and modernization in India [c3]. Jute is highly valued for being 100% biodegradable, recyclable, and eco-friendly, making it a sustainable alternative to synthetic materials like nylon [t3][t6]. While cotton, hemp, and silk are also major fibre crops, the specific epithet 'Golden Fibre' is uniquely associated with jute [c1][t2].

Sources

1. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 4: The Age of Industrialisation > TYPES OF FARMING > p. 87
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 11: Industries > 1. Shortage of Raw Material > p. 22
3. [3] https://www.thehindu.com/photos/in-frames-jute-the-golden-fibre/article68644866.ece