Create a fold in the centre of your length of gold.  Using a single thread waxed with beeswax, stitch over the folded gold passing to secure it in the centre of the circle.

Bend the gold passing around to start the spiral, keeping both strands of passing together.  Bring the needle up through the fabric at the outer edge of the gold (approximately 3-4mm away from the first stitch) and stitch over both threads.  Manipulate the gold to form a tight curve, then bring the needle up next to it on the outer side and stitch over both threads, as before.  Make sure that there are no gaps between the gold threads.

Continue stitching the gold in a tight circle: bring the needle up on the outside of the circle and down in between the current threads and the previously worked ones.  When taking your needle down, angle the needle underneath the previously worked gold threads to keep them snugly together. Position your stitches an equal distance apart.

As you continue to increase the circle, ensure the gold threads lie flat and parallel without crossing or untwisting.
The correct spacing can clearly be seen here: the stitches are an equal distance from each other, and the stitches for each new spiral fit between those of the previous spiral to form a bricked effect.

When the circle is the desired size, plunge the gold threads through to the back of the base fabric .

On the underside; bend the gold threads back on themselves and secure by oversewing them with a curved needle. Trim off any excess gold threads on the back to finish.